feat: some basic poc

.gitignore

@@ -0,0 +1,43 @@
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+.kotlin
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

build.gradle.kts

@@ -0,0 +1,24 @@
+plugins {
+    id("java")
+}
+
+group = "org.example"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation("org.keycloak:keycloak-core:26.6.3")
+    implementation("org.keycloak:keycloak-services:26.6.3")
+    implementation("org.keycloak:keycloak-server-spi:26.6.3")
+    testImplementation(platform("org.junit:junit-bom:6.0.0"))
+    testImplementation("org.junit.jupiter:junit-jupiter")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+
+}
+
+tasks.test {
+    useJUnitPlatform()
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Wed Jun 24 20:43:20 CEST 2026
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.0-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,237 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original 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 POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+  APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path
+  [ -h "$app_path" ]
+do
+  ls=$(ls -ld "$app_path")
+  link=${ls#*' -> '}
+  case $link in         #(
+  /*) app_path=$link ;; #(
+  *) app_path=$APP_HOME$link ;;
+  esac
+done
+
+APP_HOME=$(cd "${APP_HOME:-./}" && pwd -P) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn() {
+  echo "$*"
+} >&2
+
+die() {
+  echo
+  echo "$*"
+  echo
+  exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$(uname)" in           #(
+CYGWIN*) cygwin=true ;;      #(
+Darwin*) darwin=true ;;      #(
+MSYS* | 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" && ! "$darwin" && ! "$nonstop"; then
+  case $MAX_FD in #(
+  max*)
+    MAX_FD=$(ulimit -H -n) ||
+      warn "Could not query maximum file descriptor limit"
+    ;;
+  esac
+  case $MAX_FD in #(
+  '' | soft) : ;; #(
+  *)
+    ulimit -n "$MAX_FD" ||
+      warn "Could not set maximum file descriptor limit to $MAX_FD"
+    ;;
+  esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys"; then
+  APP_HOME=$(cygpath --path --mixed "$APP_HOME")
+  CLASSPATH=$(cygpath --path --mixed "$CLASSPATH")
+
+  JAVACMD=$(cygpath --unix "$JAVACMD")
+
+  # Now convert the arguments - kludge to limit ourselves to /bin/sh
+  for arg; do
+    if
+      case $arg in #(
+      -*) false ;; # don't mess with options #(
+      /?*)
+        t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath
+        [ -e "$t" ]
+        ;; #(
+      *) false ;;
+      esac
+    then
+      arg=$(cygpath --path --ignore --mixed "$arg")
+    fi
+    # Roll the args list around exactly as many times as the number of
+    # args, so each arg winds up back in the position where it started, but
+    # possibly modified.
+    #
+    # NB: a `for` loop captures its iteration list before it begins, so
+    # changing the positional parameters here affects neither the number of
+    # iterations, nor the values presented in `arg`.
+    shift              # remove old arg
+    set -- "$@" "$arg" # push replacement arg
+  done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+  "-Dorg.gradle.appname=$APP_BASE_NAME" \
+  -classpath "$CLASSPATH" \
+  org.gradle.wrapper.GradleWrapperMain \
+  "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+  printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+    xargs -n1 |
+    sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+    tr '\n' ' '
+)" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

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+@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.kts

@@ -0,0 +1 @@
+rootProject.name = "keycloak-oidc-param"

src/main/java/org/example/auth/provider/mapper/CustomProtocolMapper.java

@@ -0,0 +1,67 @@
+package org.example.auth.provider.mapper;
+
+import org.keycloak.models.*;
+import org.keycloak.protocol.oidc.mappers.*;
+import org.keycloak.provider.*;
+import org.keycloak.representations.*;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class CustomProtocolMapper extends AbstractOIDCProtocolMapper implements OIDCAccessTokenMapper, OIDCIDTokenMapper, UserInfoTokenMapper {
+    public static final String PROVIDER_ID = "custom-protocol-mapper";
+    private static final String REQUEST_PARAM_NAME = "requestParamName";
+
+    private static final List<ProviderConfigProperty> configProperties = new ArrayList<>();
+
+    static {
+        ProviderConfigProperty paramNameProp = new ProviderConfigProperty();
+        paramNameProp.setName(REQUEST_PARAM_NAME);
+        paramNameProp.setLabel("Request Parameter Name");
+        paramNameProp.setHelpText("Name of the token request form parameter to read");
+        paramNameProp.setType(ProviderConfigProperty.STRING_TYPE);
+        configProperties.add(paramNameProp);
+        OIDCAttributeMapperHelper.addTokenClaimNameConfig(configProperties);
+        OIDCAttributeMapperHelper.addIncludeInTokensConfig(configProperties, CustomProtocolMapper.class);
+    }
+
+    @Override
+    public String getDisplayCategory() {
+        return "Token Mapper";
+    }
+
+    @Override
+    public String getDisplayType() {
+        return "Request Param to Claim";
+    }
+
+    @Override
+    public String getHelpText() {
+        return "Reads a form parameter from the token request and maps it to a token claim";
+    }
+
+    @Override
+    public List<ProviderConfigProperty> getConfigProperties() {
+        return configProperties;
+    }
+
+    @Override
+    public String getId() {
+        return PROVIDER_ID;
+    }
+
+    @Override
+    protected void setClaim(IDToken token, ProtocolMapperModel mappingModel, UserSessionModel userSession, KeycloakSession keycloakSession, ClientSessionContext clientSessionCtx) {
+        String paramName = mappingModel.getConfig().get(REQUEST_PARAM_NAME);
+        String claimName = mappingModel.getConfig().get(OIDCAttributeMapperHelper.TOKEN_CLAIM_NAME);
+        if (paramName == null || claimName == null) return;
+
+        final var httpRequest = keycloakSession.getContext().getHttpRequest();
+        if (httpRequest == null) return;
+        final var formParams = httpRequest.getDecodedFormParameters();
+        final var paramValue = formParams.getFirst(paramName);
+        if (paramValue != null) {
+            OIDCAttributeMapperHelper.mapClaim(token, mappingModel, paramValue);
+        }
+    }
+}

src/main/java/org/example/auth/provider/mapper/OrganizationValidatedProtocolMapper.java

@@ -0,0 +1,111 @@
+package org.example.auth.provider.mapper;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.keycloak.models.*;
+import org.keycloak.organization.OrganizationProvider;
+import org.keycloak.protocol.oidc.mappers.*;
+import org.keycloak.provider.*;
+import org.keycloak.representations.*;
+
+public class OrganizationValidatedProtocolMapper extends AbstractOIDCProtocolMapper implements OIDCAccessTokenMapper, OIDCIDTokenMapper, UserInfoTokenMapper {
+    public static final String PROVIDER_ID = "org-validated-custom-protocol-mapper";
+    private static final String REQUEST_PARAM_NAME = "requestParamName";
+    private static final String ORG_ATTRIBUTE_NAME = "orgAttributeName";
+    private static final String MATCH_ANY_ORG = "matchAnyOrg";
+
+    private static final List<ProviderConfigProperty> configProperties = new ArrayList<>();
+
+    static {
+        ProviderConfigProperty paramNameProp = new ProviderConfigProperty();
+        paramNameProp.setName(REQUEST_PARAM_NAME);
+        paramNameProp.setLabel("Request Parameter Name");
+        paramNameProp.setHelpText("Name of the token request form parameter to read");
+        paramNameProp.setType(ProviderConfigProperty.STRING_TYPE);
+        configProperties.add(paramNameProp);
+
+        ProviderConfigProperty attrNameProp = new ProviderConfigProperty();
+        attrNameProp.setName(ORG_ATTRIBUTE_NAME);
+        attrNameProp.setLabel("Organization Attribute Name");
+        attrNameProp.setHelpText("Name of the organization attribute whose value must match the request parameter value");
+        attrNameProp.setType(ProviderConfigProperty.STRING_TYPE);
+        configProperties.add(attrNameProp);
+
+        ProviderConfigProperty matchAnyProp = new ProviderConfigProperty();
+        matchAnyProp.setName(MATCH_ANY_ORG);
+        matchAnyProp.setLabel("Match Any Organization");
+        matchAnyProp.setHelpText("If true, the request value needs to match on any one of the user's organizations. If false, it must match on all of them.");
+        matchAnyProp.setType(ProviderConfigProperty.BOOLEAN_TYPE);
+        configProperties.add(matchAnyProp);
+
+        OIDCAttributeMapperHelper.addTokenClaimNameConfig(configProperties);
+        OIDCAttributeMapperHelper.addIncludeInTokensConfig(configProperties, OrganizationValidatedProtocolMapper.class);
+    }
+
+    @Override
+    public String getDisplayCategory() {
+        return "Token Mapper";
+    }
+
+    @Override
+    public String getDisplayType() {
+        return "Organization-Validated Request Param to Claim";
+    }
+
+    @Override
+    public String getHelpText() {
+        return "Reads a form parameter from the token request and maps it to a token claim only if the value is assigned as an attribute of an organization the user belongs to";
+    }
+
+    @Override
+    public List<ProviderConfigProperty> getConfigProperties() {
+        return configProperties;
+    }
+
+    @Override
+    public String getId() {
+        return PROVIDER_ID;
+    }
+
+    @Override
+    protected void setClaim(IDToken token, ProtocolMapperModel mappingModel, UserSessionModel userSession, KeycloakSession keycloakSession, ClientSessionContext clientSessionCtx) {
+        String paramName = mappingModel.getConfig().get(REQUEST_PARAM_NAME);
+        String claimName = mappingModel.getConfig().get(OIDCAttributeMapperHelper.TOKEN_CLAIM_NAME);
+        String orgAttrName = mappingModel.getConfig().get(ORG_ATTRIBUTE_NAME);
+        if (paramName == null || claimName == null || orgAttrName == null) return;
+
+        boolean matchAny = Boolean.parseBoolean(mappingModel.getConfig().getOrDefault(MATCH_ANY_ORG, "true"));
+
+        final var httpRequest = keycloakSession.getContext().getHttpRequest();
+        if (httpRequest == null) return;
+        final var formParams = httpRequest.getDecodedFormParameters();
+        final var paramValue = formParams.getFirst(paramName);
+        if (paramValue == null) return;
+
+        UserModel user = userSession.getUser();
+        if (user == null) return;
+
+        OrganizationProvider orgProvider = keycloakSession.getProvider(OrganizationProvider.class);
+        if (orgProvider == null) return;
+
+        List<OrganizationModel> userOrgs = orgProvider.getByMember(user).toList();
+        if (userOrgs.isEmpty()) return;
+
+        if (matchAny) {
+            boolean matched = userOrgs.stream()
+                    .anyMatch(org -> org.getAttributes()
+                            .getOrDefault(orgAttrName, List.of())
+                            .contains(paramValue));
+            if (!matched) return;
+        } else {
+            boolean allMatch = userOrgs.stream()
+                    .allMatch(org -> org.getAttributes()
+                            .getOrDefault(orgAttrName, List.of())
+                            .contains(paramValue));
+            if (!allMatch) return;
+        }
+
+        OIDCAttributeMapperHelper.mapClaim(token, mappingModel, paramValue);
+    }
+}

src/main/resources/META-INF/services/org.keycloak.protocol.ProtocolMapper

@@ -0,0 +1,2 @@
+org.example.auth.provider.mapper.CustomProtocolMapper
+org.example.auth.provider.mapper.OrganizationValidatedProtocolMapper