Initial commit

.gitignore

@@ -0,0 +1,7 @@
+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build
+
+.idea

README.md

@@ -0,0 +1,5 @@
+= Kotlin Client for PostgREST
+
+Kotlin JVMclient for [PostgREST](https://postgrest.org/)
+
+WIP

build.gradle

@@ -0,0 +1,132 @@
+plugins {
+    // Apply the org.jetbrains.kotlin.jvm Plugin to add support for Kotlin.
+    id 'org.jetbrains.kotlin.jvm' version '1.4.21'
+
+    // Apply the java-library plugin for API and implementation separation.
+    id 'java-library'
+
+    id "com.github.ben-manes.versions" version "0.36.0"
+
+    id "maven-publish"
+
+    id "com.jfrog.bintray" version "1.8.5"
+}
+
+String currentVersion = '0.2.0'
+
+group = 'io.supabase'
+version = currentVersion
+
+repositories {
+    jcenter()
+}
+
+dependencies {
+
+    compile "org.apache.httpcomponents.client5:httpclient5:5.0.3"
+
+    // Align versions of all Kotlin components
+    implementation platform('org.jetbrains.kotlin:kotlin-bom')
+
+    implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8'
+
+    implementation "com.fasterxml.jackson.module:jackson-module-kotlin:2.12.1"
+    implementation "com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.12.1"
+
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.7.0'
+    testImplementation "io.mockk:mockk:1.10.5"
+    testImplementation 'com.willowtreeapps.assertk:assertk-jvm:0.23'
+    testCompile "com.github.tomakehurst:wiremock-jre8:2.27.2"
+
+}
+
+compileKotlin {
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+compileTestKotlin {
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+test {
+    useJUnitPlatform()
+}
+
+task sourcesJar(type: Jar) {
+    from sourceSets.main.allSource
+}
+
+task javadocJar(type: Jar, dependsOn: project.javadoc) {
+    from javadoc.destinationDir
+}
+
+def pomConfig = {
+    licenses {
+        license {
+            name "The MIT License"
+            url "https://opensource.org/licenses/MIT"
+            distribution "repo"
+        }
+    }
+    developers {
+        developer {
+            id "kevcodez"
+            name "Kevin Grüneberg"
+            email "k.grueneberg1994@gmail.com"
+        }
+    }
+
+    scm {
+        url "https://github.com/supabase/postgrest-kt"
+    }
+}
+
+publishing {
+    publications {
+        mavenPublication(MavenPublication) {
+            from components.java
+
+            artifact sourcesJar {
+                classifier "sources"
+            }
+            artifact javadocJar {
+                classifier "javadoc"
+            }
+
+            groupId 'io.supabase'
+            artifactId 'postgrest-kt'
+            pom.withXml {
+                def root = asNode()
+                root.appendNode('description', 'Kotlin JVM client for PostgREST API.')
+                root.appendNode('name', 'PostgREST Kotlin')
+                root.appendNode('url', 'https://github.com/supabase/postgrest-kt')
+                root.children().last() + pomConfig
+            }
+        }
+    }
+}
+
+bintray {
+    user = System.getenv("bintray_user") ?: findProperty("bintray_user")
+    key = System.getenv("bintray_key") ?: findProperty("bintray_key")
+    publications = ['mavenPublication']
+    publish = true
+
+    pkg {
+        repo = 'supabase'
+        name = 'postgrest-kt'
+        userOrg = 'supabase'
+        licenses = ['MIT']
+        vcsUrl = 'https://github.com/supabase/postgrest-kt.git'
+        version {
+            name = currentVersion
+            desc = currentVersion
+            released  = new Date()
+        }
+    }
+
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'postgrest-kt'

src/main/kotlin/io/supabase/postgrest/PostgrestClient.kt

@@ -0,0 +1,23 @@
+package io.supabase.postgrest
+
+import io.supabase.postgrest.builder.PostgrestQueryBuilder
+import io.supabase.postgrest.http.PostgrestHttpClient
+import java.net.URI
+
+open class PostgrestClient(
+        private val uri: URI,
+        private val postgrestHttpClient: PostgrestHttpClient,
+        private val defaultHeaders: Map<String, String> = emptyMap()
+) {
+
+    /**
+     * Perform a table operation.
+     *
+     * @param[table]  The table name to operate on.
+     */
+    fun <T : Any> from(table: String): PostgrestQueryBuilder<T> {
+        val uri = URI("$uri/$table")
+        return PostgrestQueryBuilder(uri, postgrestHttpClient, defaultHeaders)
+    }
+
+}

src/main/kotlin/io/supabase/postgrest/PostgrestDefaultClient.kt

@@ -0,0 +1,27 @@
+package io.supabase.postgrest
+
+import io.supabase.postgrest.http.PostgrestHttpClient
+import io.supabase.postgrest.http.PostgrestHttpClientApache
+import io.supabase.postgrest.json.PostgrestJsonConverter
+import io.supabase.postgrest.json.PostgrestJsonConverterJackson
+import org.apache.hc.client5.http.impl.classic.HttpClients
+import java.net.URI
+
+val jsonConverter = PostgrestJsonConverterJackson()
+
+/**
+ * The default client uses Apache HTTP client 5.x and Jackson FasterXML for DTO conversion.
+ *
+ * If you want to customize, implement [PostgrestHttpClient] and [PostgrestJsonConverter].
+ */
+class PostgrestDefaultClient(
+        uri: URI,
+        defaultHeaders: Map<String, String> = emptyMap()
+) : PostgrestClient(
+        postgrestHttpClient = PostgrestHttpClientApache(
+                httpClient = HttpClients.createDefault(),
+                postgrestJsonConverter = jsonConverter
+        ),
+        defaultHeaders = defaultHeaders,
+        uri = uri
+)

src/main/kotlin/io/supabase/postgrest/builder/PostgrestBuilder.kt

@@ -0,0 +1,62 @@
+package io.supabase.postgrest.builder
+
+import io.supabase.postgrest.http.HttpResponse
+import io.supabase.postgrest.http.PostgrestHttpClient
+import org.apache.hc.core5.http.Method
+import java.net.URI
+
+open class PostgrestBuilder<T : Any> {
+
+    private val postgrestHttpClient: PostgrestHttpClient
+    private val url: URI
+
+    private var headers: MutableMap<String, String> = mutableMapOf()
+    private var method: Method? = null
+    private var schema: String? = null
+    private var body: Any? = null
+    private var searchParams: MutableMap<String, String> = mutableMapOf()
+
+    constructor(builder: PostgrestBuilder<T>) {
+        this.headers = builder.headers
+        this.method = builder.method
+        this.postgrestHttpClient = builder.postgrestHttpClient
+        this.url = builder.url
+        this.schema = builder.schema
+        this.body = builder.body
+    }
+
+    constructor(url: URI, postgrestHttpClient: PostgrestHttpClient, defaultHeaders: Map<String, String>) {
+        this.url = url
+        this.postgrestHttpClient = postgrestHttpClient
+
+        defaultHeaders.forEach { (name, value) -> setHeader(name, value) }
+    }
+
+    protected fun setHeader(name: String, value: String) {
+        this.headers[name] = value
+    }
+
+    protected fun setSearchParam(name: String, value: String) {
+        this.searchParams[name] = value
+    }
+
+    protected fun setMethod(method: Method) {
+        this.method = method
+    }
+
+    protected fun setBody(body: Any?) {
+        this.body = body
+    }
+
+    fun execute(): HttpResponse {
+        checkNotNull(method) { "Method cannot be null" }
+
+        return postgrestHttpClient.execute(
+                url = url,
+                method = method!!,
+                headers = headers,
+                body = body,
+                schema = schema
+        )
+    }
+}

src/main/kotlin/io/supabase/postgrest/builder/PostgrestFilterBuilder.kt

@@ -0,0 +1,305 @@
+package io.supabase.postgrest.builder
+
+import kotlin.reflect.KProperty
+
+class PostgrestFilterBuilder<T : Any>(builder: PostgrestBuilder<T>) : PostgrestTransformBuilder<T>(builder) {
+
+    /**
+     * Finds all rows which doesn't satisfy the filter.
+     *
+     * @param column  The column to filter on.
+     * @param operator  The operator to filter with.
+     * @param value  The value to filter with.
+     */
+    fun not(column: KProperty<T>, operator: FilterOperator, value: Any): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "not.${operator.identifier}.${value}")
+        return this
+    }
+
+    /**
+     * Finds all rows satisfying at least one of the filters.
+     *
+     * @param filters  The filters to use, separated by commas.
+     */
+    fun or(filters: String): PostgrestFilterBuilder<T> {
+        setSearchParam("or", "(${filters})")
+        return this
+    }
+
+    /**
+     * Finds all rows whose value on the stated "column" exactly matches the
+     * specified "value".
+     *
+     * @param column  The column to filter on.
+     * @param value  The value to filter with.
+     */
+    fun eq(column: KProperty<T>, value: Any): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "eq.${value}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose value on the stated "column" doesn't match the
+     * specified "value".
+     *
+     * @param column  The column to filter on.
+     * @param value  The value to filter with.
+     */
+    fun neq(column: KProperty<T>, value: T): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "neq.${value}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose value on the stated "column" is greater than the
+     * specified "value".
+     *
+     * @param column  The column to filter on.
+     * @param value  The value to filter with.
+     */
+    fun gt(column: KProperty<T>, value: T): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "gt.${value}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose value on the stated "column" is greater than or
+     * equal to the specified "value".
+     *
+     * @param column  The column to filter on.
+     * @param value  The value to filter with.
+     */
+    fun gte(column: KProperty<T>, value: T): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "gte.${value}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose value on the stated "column" is less than the
+     * specified "value".
+     *
+     * @param column  The column to filter on.
+     * @param value  The value to filter with.
+     */
+    fun lt(column: KProperty<T>, value: T): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "lt.${value}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose value on the stated "column" is less than or equal
+     * to the specified "value".
+     *
+     * @param column  The column to filter on.
+     * @param value  The value to filter with.
+     */
+    fun lte(column: KProperty<T>, value: T): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "lte.${value}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose value in the stated "column" matches the supplied
+     * "pattern" (case sensitive).
+     *
+     * @param column  The column to filter on.
+     * @param pattern  The pattern to filter with.
+     */
+    fun like(column: KProperty<T>, pattern: String): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "like.${pattern}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose value in the stated "column" matches the supplied
+     * "pattern" (case insensitive).
+     *
+     * @param column  The column to filter on.
+     * @param pattern  The pattern to filter with.
+     */
+    fun ilike(column: KProperty<T>, pattern: String): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "ilike.${pattern}")
+        return this
+    }
+
+    /**
+     * A check for exact equality (null, true, false), finds all rows whose
+     * value on the stated "column" exactly match the specified "value".
+     *
+     * @param column  The column to filter on.
+     * @param value  The value to filter with.
+     */
+    fun `is`(column: KProperty<T>, value: Boolean?): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "is.${value}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose value on the stated "column" is found on the
+     * specified "values".
+     *
+     * @param column  The column to filter on.
+     * @param values  The values to filter with.
+     */
+    fun `in`(column: KProperty<T>, values: List<Any>): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "in.(${cleanFilterArray(values)})")
+        return this
+    }
+
+    private fun cleanFilterArray(values: List<Any>): String {
+        return values.joinToString(",") { s -> """"$s"""" }
+    }
+
+    /**
+     * Finds all rows whose range value on the stated "column" is strictly to the
+     * left of the specified "range".
+     *
+     * @param column  The column to filter on.
+     * @param range  The range to filter with.
+     */
+    fun sl(column: KProperty<T>, range: String): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "sl.${range}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose range value on the stated "column" is strictly to
+     * the right of the specified "range".
+     *
+     * @param column  The column to filter on.
+     * @param range  The range to filter with.
+     */
+    fun sr(column: KProperty<T>, range: String): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "sr.${range}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose range value on the stated "column" does not extend
+     * to the left of the specified "range".
+     *
+     * @param column  The column to filter on.
+     * @param range  The range to filter with.
+     */
+    fun nxl(column: KProperty<T>, range: String): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "nxl.${range}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose range value on the stated "column" does not extend
+     * to the right of the specified "range".
+     *
+     * @param column  The column to filter on.
+     * @param range  The range to filter with.
+     */
+    fun nxr(column: KProperty<T>, range: String): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "nxr.${range}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose range value on the stated "column" is adjacent to
+     * the specified "range".
+     *
+     * @param column  The column to filter on.
+     * @param range  The range to filter with.
+     */
+    fun adj(column: KProperty<T>, range: String): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "adj.${range}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose tsvector value on the stated "column" matches
+     * to_tsquery("query").
+     *
+     * @param column  The column to filter on.
+     * @param query  The Postgres tsquery String to filter with.
+     * @param config  The text search configuration to use.
+     */
+    fun fts(column: KProperty<T>, query: String, config: String? = null): PostgrestFilterBuilder<T> {
+        val configPart = if (config === null) "" else "(${config})"
+        setSearchParam(column.name, "fts${configPart}.${query}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose tsvector value on the stated "column" matches
+     * plainto_tsquery("query").
+     *
+     * @param column  The column to filter on.
+     * @param query  The Postgres tsquery String to filter with.
+     * @param config  The text search configuration to use.
+     */
+    fun plfts(column: KProperty<T>, query: String, config: String? = null): PostgrestFilterBuilder<T> {
+        val configPart = if (config === null) "" else "(${config})"
+        setSearchParam(column.name, "plfts${configPart}.${query}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose tsvector value on the stated "column" matches
+     * phraseto_tsquery("query").
+     *
+     * @param column  The column to filter on.
+     * @param query  The Postgres tsquery String to filter with.
+     * @param config  The text search configuration to use.
+     */
+    fun phfts(column: KProperty<T>, query: String, config: String? = null): PostgrestFilterBuilder<T> {
+        val configPart = if (config === null) "" else "(${config})"
+        setSearchParam(column.name, "phfts${configPart}.${query}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose tsvector value on the stated "column" matches
+     * websearch_to_tsquery("query").
+     *
+     * @param column  The column to filter on.
+     * @param query  The Postgres tsquery String to filter with.
+     * @param config  The text search configuration to use.
+     */
+    fun wfts(column: KProperty<T>, query: String, config: String? = null): PostgrestFilterBuilder<T> {
+        val configPart = if (config === null) "" else "(${config})"
+        setSearchParam(column.name, "wfts${configPart}.${query}")
+        return this
+    }
+
+    /**
+     * Finds all rows whose "column" satisfies the filter.
+     *
+     * @param column  The column to filter on.
+     * @param operator  The operator to filter with.
+     * @param value  The value to filter with.
+     */
+    fun filter(column: KProperty<T>, operator: FilterOperator, value: Any): PostgrestFilterBuilder<T> {
+        setSearchParam(column.name, "${operator.identifier}.${value}")
+        return this
+    }
+}
+
+enum class FilterOperator(val identifier: String) {
+    EQ("eq"),
+    NEQ("neq"),
+    GT("gt"),
+    GTE("gte"),
+    LT("lt"),
+    LTE("lte"),
+    LIKE("like"),
+    ILIKE("ilike"),
+    IS("is"),
+    IN("in"),
+    CS("cs"),
+    CD("cd"),
+    SL("sl"),
+    SR("sr"),
+    NXL("nxl"),
+    NXR("nxr"),
+    ADJ("adj"),
+    OV("ov"),
+    FTS("fts"),
+    PLFTS("plfts"),
+    PHFTS("phfts"),
+    WFTS("wfts"),
+}

src/main/kotlin/io/supabase/postgrest/builder/PostgrestQueryBuilder.kt

@@ -0,0 +1,94 @@
+package io.supabase.postgrest.builder
+
+import io.supabase.postgrest.http.PostgrestHttpClient
+import org.apache.hc.core5.http.Method
+import java.net.URI
+
+class PostgrestQueryBuilder<T : Any>(url: URI, postgrestHttpClient: PostgrestHttpClient, defaultHeaders: Map<String, String>) : PostgrestBuilder<T>(url, postgrestHttpClient, defaultHeaders) {
+
+    /**
+     * Performs vertical filtering with SELECT.
+     *
+     * @param[columns] The columns to retrieve, separated by commas.
+     * @param[head] When set to true, select will void data.
+     * @param[count] Count algorithm to use to count rows in a table.
+     */
+    fun select(
+            columns: String = "*",
+            head: Boolean = false,
+            count: Count? = null
+    ): PostgrestFilterBuilder<T> {
+        setMethod(Method.GET)
+
+        val cleanedColumns = cleanColumns(columns)
+
+        setSearchParam("select", cleanedColumns)
+
+        if (count != null) {
+            setHeader("Prefer", "count=${count.identifier}")
+        }
+
+        if (head) {
+            setMethod(Method.HEAD)
+        }
+
+        return PostgrestFilterBuilder(this)
+    }
+
+    fun insert(value: List<T>, upsert: Boolean = false, onConflict: String? = null, returning: Returning = Returning.REPRESENTATION, count: Count?): PostgrestFilterBuilder<T> {
+        setMethod(Method.POST)
+
+        val preferHeaders = mutableListOf<String>("return=${returning.identifier}")
+        if (upsert) preferHeaders.add("resolution=merge-duplicates")
+
+        if (upsert && onConflict != null) setSearchParam("on_conflict", onConflict)
+        setBody(value)
+
+        if (count != null) {
+            preferHeaders.add("count=${count}")
+        }
+
+        setHeader("Prefer", preferHeaders.joinToString(","))
+
+        return PostgrestFilterBuilder(this)
+    }
+
+    fun insert(value: T, upsert: Boolean = false, onConflict: String? = null, returning: Returning = Returning.REPRESENTATION, count: Count?): PostgrestFilterBuilder<T> {
+        return insert(listOf(value), upsert, onConflict, returning, count)
+    }
+
+    fun update(value: Any, returning: Returning = Returning.REPRESENTATION, count: Count?): PostgrestFilterBuilder<T> {
+        setMethod(Method.PATCH)
+        val prefersHeaders = mutableListOf("return=${returning.identifier}")
+        setBody(value)
+        if (count != null) {
+            prefersHeaders.add("count=${count}")
+        }
+        setHeader("Prefer", prefersHeaders.joinToString(","))
+
+        return PostgrestFilterBuilder(this)
+    }
+
+    fun delete(returning: Returning = Returning.REPRESENTATION, count: Count?): PostgrestFilterBuilder<T> {
+        setMethod(Method.DELETE)
+
+        val prefersHeaders = mutableListOf("return=${returning.identifier}")
+        if (count != null) {
+            prefersHeaders.add("count=${count}")
+        }
+        setHeader("Prefer", prefersHeaders.joinToString(","))
+
+        return PostgrestFilterBuilder(this)
+    }
+}
+
+enum class Count(val identifier: String) {
+    EXACT("exact"),
+    PLANNED("planned"),
+    ESTIMATED("estimated")
+}
+
+enum class Returning(val identifier: String) {
+    MINIMAL("minimal"),
+    REPRESENTATION("representation")
+}

src/main/kotlin/io/supabase/postgrest/builder/PostgrestTransformBuilder.kt

@@ -0,0 +1,48 @@
+package io.supabase.postgrest.builder
+
+import kotlin.reflect.KProperty
+
+open class PostgrestTransformBuilder<T : Any>(builder: PostgrestBuilder<T>) : PostgrestBuilder<T>(builder) {
+
+    fun select(columns: String = "*"): PostgrestTransformBuilder<T> {
+        val cleanedColumns = cleanColumns(columns)
+        setSearchParam("select", cleanedColumns)
+
+        return this
+    }
+
+    fun order(column: KProperty<T>, ascending: Boolean = true, nullsFirst: Boolean = false, foreignTable: String? = null): PostgrestTransformBuilder<T> {
+        val key = if (foreignTable == null) "order" else """"$foreignTable".order"""
+        setSearchParam(
+                key,
+                "${column}.${if (ascending) "asc" else "desc"}.${if (nullsFirst) "nullsfirst" else "nullslast"}"
+        )
+
+        return this
+    }
+
+    fun limit(count: Long, foreignTable: String? = null): PostgrestTransformBuilder<T> {
+        val key = if (foreignTable == null) "limit" else """"$foreignTable".limit"""
+        setSearchParam(key, count.toString())
+
+        return this
+    }
+
+    fun range(from: Long, to: Long, foreignTable: String? = null): PostgrestTransformBuilder<T> {
+        val keyOffset = if (foreignTable == null) "offset" else """"$foreignTable".offset"""
+        val keyLimit = if (foreignTable == null) "limit" else """"$foreignTable".limit"""
+
+        setSearchParam(keyOffset, from.toString())
+        // Range is inclusive, so add 1
+        setSearchParam(keyLimit, (to - from + 1).toString())
+
+        return this
+    }
+
+    fun single(): PostgrestTransformBuilder<T> {
+        setHeader(org.apache.hc.core5.http.HttpHeaders.ACCEPT, "application/vnd.pgrst.object+json")
+
+        return this
+    }
+
+}

src/main/kotlin/io/supabase/postgrest/builder/Util.kt

@@ -0,0 +1,21 @@
+package io.supabase.postgrest.builder
+
+/**
+ * Remove whitespaces except when quoted
+ */
+fun cleanColumns(columns: String): String {
+    var quoted = false
+
+    return columns
+            .split("")
+            .map { character ->
+                if (character.matches(Regex("\\s")) && !quoted) {
+                    return@map ""
+                }
+                if (character == "\"") {
+                    quoted = !quoted
+                }
+
+                return@map character
+            }.joinToString("")
+}

src/main/kotlin/io/supabase/postgrest/http/PostgrestHttpClient.kt

@@ -0,0 +1,25 @@
+package io.supabase.postgrest.http
+
+import org.apache.hc.core5.http.Method
+import java.net.URI
+
+/**
+ * Interface used by the PostgrestClient, allows replacing the default HTTP client.
+ *
+ * Overwrite it to replace the default Apache HTTP Client implementation.
+ */
+interface PostgrestHttpClient {
+
+    fun execute(
+            url: URI,
+            method: Method,
+            headers: Map<String, String> = emptyMap(),
+            body: Any? = null,
+            schema: String? = null,
+    ): HttpResponse
+}
+
+data class HttpResponse(
+        val status: Int,
+        val body: String?
+)

src/main/kotlin/io/supabase/postgrest/http/PostgrestHttpClientApache.kt

@@ -0,0 +1,60 @@
+package io.supabase.postgrest.http
+
+import io.supabase.postgrest.json.PostgrestJsonConverter
+import org.apache.hc.client5.http.classic.methods.HttpUriRequestBase
+import org.apache.hc.client5.http.impl.classic.CloseableHttpClient
+import org.apache.hc.core5.http.ClassicHttpResponse
+import org.apache.hc.core5.http.HttpStatus
+import org.apache.hc.core5.http.Method
+import org.apache.hc.core5.http.io.HttpClientResponseHandler
+import org.apache.hc.core5.http.io.entity.EntityUtils
+import org.apache.hc.core5.http.io.entity.StringEntity
+import java.net.URI
+
+/**
+ * Default implementation of the [PostgrestHttpClient] used by the PostgrestDefaultClient.
+ *
+ * Uses closable apache HTTP-Client 5.x.
+ */
+class PostgrestHttpClientApache(
+        private val httpClient: CloseableHttpClient,
+        private val postgrestJsonConverter: PostgrestJsonConverter
+) : PostgrestHttpClient {
+
+    override fun execute(url: URI, method: Method, headers: Map<String, String>, body: Any?, schema: String?): HttpResponse {
+        return httpClient.use { httpClient ->
+            val httpRequest = HttpUriRequestBase(method.name, url)
+            body?.apply {
+                val dataAsString = postgrestJsonConverter.serialize(body)
+                httpRequest.entity = StringEntity(dataAsString)
+            }
+            headers.forEach { (name, value) -> httpRequest.addHeader(name, value) }
+
+            return@use httpClient.execute(httpRequest, responseHandler())
+        }
+    }
+
+    private fun responseHandler(): HttpClientResponseHandler<HttpResponse> {
+        return HttpClientResponseHandler<HttpResponse> { response ->
+            throwIfError(response)
+
+            val body = response.entity?.let { EntityUtils.toString(it) }
+
+            return@HttpClientResponseHandler HttpResponse(
+                    status = response.code,
+                    body = body
+            )
+        }
+    }
+
+    private fun throwIfError(response: ClassicHttpResponse) {
+        val status = response.code
+        val statusSuccessful = status >= HttpStatus.SC_SUCCESS && status < HttpStatus.SC_REDIRECTION
+
+        if (!statusSuccessful) {
+            val entityAsString = response.entity?.let { EntityUtils.toString(it) }
+
+            throw PostgrestHttpException(status, entityAsString)
+        }
+    }
+}

src/main/kotlin/io/supabase/postgrest/http/PostgrestHttpException.kt

@@ -0,0 +1,11 @@
+package io.supabase.postgrest.http
+
+/**
+ * Exception is used when a bad status code (> 301) is returned.
+ *
+ * If you implement your custom PostgrestHttpClient, you need to handle exceptions on your own.
+ *
+ * @property[status] HTTP status code
+ * @property[httpBody] Response body as [String] if available
+ */
+class PostgrestHttpException(val status: Int, val httpBody: String?) : RuntimeException("Unexpected response status: $status")

src/main/kotlin/io/supabase/postgrest/json/PostgrestJsonConverter.kt

@@ -0,0 +1,28 @@
+package io.supabase.postgrest.json
+
+/**
+ * Interface used by the PostgrestClient, allows replacing the default JSON converter.
+ *
+ * Overwrite it to replace the default Jackson FasterXML implementation.
+ */
+interface PostgrestJsonConverter {
+
+    /**
+     * Serializes [data] as JSON string.
+     *
+     * @param[data] the data to serialize
+     *
+     * @return JSON string
+     */
+    fun serialize(data: Any): String
+
+    /**
+     * Deserializes a JSON [text] to the corresponding [responseType].
+     *
+     * @param[text] The JSON text to convert
+     * @param[responseType] The response type as Java class
+     */
+    fun <T : Any> deserialize(text: String, responseType: Class<T>): T
+}
+
+inline fun <reified T : Any> PostgrestJsonConverter.deserialize(content: String): T = deserialize(content, T::class.java)

src/main/kotlin/io/supabase/postgrest/json/PostgrestJsonConverterJackson.kt

@@ -0,0 +1,30 @@
+package io.supabase.postgrest.json
+
+import com.fasterxml.jackson.annotation.JsonInclude
+import com.fasterxml.jackson.databind.DeserializationFeature
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.databind.PropertyNamingStrategies
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule
+import com.fasterxml.jackson.module.kotlin.KotlinModule
+
+/**
+ * Default implementation of the [PostgrestJsonConverter] used by the PostgrestDefaultClient.
+ *
+ * Uses Jackson FasterXML for JSON (de)-serialization.
+ */
+class PostgrestJsonConverterJackson : PostgrestJsonConverter {
+
+    private val objectMapper = ObjectMapper()
+            .registerModule(KotlinModule())
+            .registerModule(JavaTimeModule())
+            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
+
+    override fun serialize(data: Any): String {
+        return objectMapper.writeValueAsString(data)
+    }
+
+    override fun <T : Any> deserialize(text: String, responseType: Class<T>): T {
+        return objectMapper.readValue(text, responseType)
+    }
+}
+

src/test/kotlin/io/supabase/postgrest/PostgresClientTest.kt

@@ -0,0 +1,24 @@
+package io.supabase.postgrest
+
+import org.junit.jupiter.api.Test
+import java.net.URI
+
+class PostgresClientTest {
+
+    @Test
+    fun foo() {
+        val client = PostgrestDefaultClient(
+                uri = URI("https://eyimuvrqyphojiqwapfv.supabase.co/rest/v1"),
+                defaultHeaders = mapOf("apiKey" to "xyz")
+        )
+
+        val a = client.from<Foo>("foo")
+                .select()
+                .execute()
+    }
+}
+
+data class Foo(
+        val id: Long,
+        val text: String
+)

src/test/kotlin/io/supabase/postgrest/json/PostgrestJsonConverterJackonTest.kt

@@ -0,0 +1,38 @@
+package io.supabase.postgrest.json
+
+import assertk.assertThat
+import assertk.assertions.isEqualTo
+import org.junit.jupiter.api.TestInstance
+import org.junit.jupiter.params.ParameterizedTest
+import org.junit.jupiter.params.provider.MethodSource
+import java.util.stream.Stream
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class PostgrestJsonConverterJackonTest {
+
+    private val converter = PostgrestJsonConverterJackson()
+
+    @ParameterizedTest
+    @MethodSource("serializeData")
+    fun `should serialize and deserialize`(data: Any) {
+        val serialized = converter.serialize(data)
+
+        val deserialized = converter.deserialize(serialized, data.javaClass)
+
+        assertThat(deserialized).isEqualTo(data)
+    }
+
+    @Suppress("unused")
+    private fun serializeData(): Stream<Any> {
+        return Stream.of(
+                "5",
+                mapOf("foo" to "bar", "number" to 5),
+                ConverterTestDto("bar", 5)
+        )
+    }
+}
+
+data class ConverterTestDto(
+        val prop: String,
+        val otherProp: Int
+)