Create openfeature java sdk proxy from nodejs

proxies/openfeature-java/.dockerignore

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+*.md

proxies/openfeature-java/.gitignore

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+build/
+.gradle/
+gradle/

proxies/openfeature-java/Dockerfile

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+FROM gradle:8.6.0-jdk17-alpine
+
+ARG OF_JAVA_SDK_VERSION
+ENV OF_JAVA_SDK_VERSION $OF_JAVA_SDK_VERSION
+
+ARG SDK_GITHUB_SHA
+ENV SDK_GITHUB_SHA $SDK_GITHUB_SHA
+
+ARG SDKS_TO_TEST
+ENV SDKS_TO_TEST $SDKS_TO_TEST
+
+RUN apk update && apk upgrade && \
+    apk add --no-cache bash git openssh
+
+COPY . /app
+WORKDIR /app
+
+RUN echo "Docker: install.sh"
+RUN ./install.sh
+
+RUN echo "Docker: gradle bootJar"
+RUN gradle bootJar
+
+ENTRYPOINT java -jar build/libs/openfeature-java-proxy.jar

proxies/openfeature-java/README.md

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+# OpenFeature Java Proxy
+
+This is a proxy service that bridges between the test harness and the DevCycle Java SDK. While initially intended to use OpenFeature for flag evaluation, it currently uses the DevCycle SDK directly due to the lack of an official DevCycle OpenFeature provider for Java.
+
+## Overview
+
+The OpenFeature Java Proxy provides the same functionality as the regular Java proxy and maintains compatibility with the existing test harness. It supports both local and cloud bucketing configurations using the DevCycle Java SDK.
+
+## Features
+
+- **DevCycle Integration**: Uses DevCycle Java SDK directly for feature flag evaluation
+- **Multiple Client Types**: Supports both DevCycle local and cloud clients  
+- **EdgeDB Support**: Compatible with EdgeDB when using cloud bucketing
+- **Local Bucketing**: Supports local flag evaluation for reduced latency
+- **OpenFeature API Compatibility**: Maintains the same API interface as the OpenFeature Node.js proxy
+
+## API Endpoints
+
+### GET /spec
+Returns the proxy specification including name, version, and capabilities.
+
+### POST /client
+Creates a new client instance with the specified configuration.
+
+### POST /*/*
+Executes commands on existing client instances.
+
+## Building and Running
+
+```bash
+# Build the application
+./gradlew bootJar
+
+# Run the application
+java -jar build/libs/openfeature-java-proxy.jar
+```
+
+## Docker
+
+```bash
+# Build the Docker image
+docker build -t openfeature-java-proxy .
+
+# Run the container
+docker run -p 3000:3000 openfeature-java-proxy
+```
+
+## Environment Variables
+
+- `JAVA_SDK_VERSION`: Specific version of the DevCycle Java SDK to use
+- `SDK_GITHUB_SHA`: Git SHA for using a specific development version
+- `LOCAL_MODE`: Set to "1" to use local SDK development mode
+- `SDKS_TO_TEST`: Comma-separated list of SDKs to test (should include "of-java")
+
+## Implementation Notes
+
+This proxy was originally designed to use OpenFeature for Java, but due to the lack of an official DevCycle OpenFeature provider for Java, it currently uses the DevCycle Java SDK directly. The implementation maintains the same API interface as the OpenFeature Node.js version by:
+
+- Using DevCycle SDK's `variable()` method for flag evaluation
+- Converting DevCycle variables to the expected DVCVariable format
+- Supporting both local and cloud DevCycle clients
+- Maintaining compatibility with the existing test harness commands
+
+Future updates may integrate an official DevCycle OpenFeature provider when available.

proxies/openfeature-java/build.gradle

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+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '3.1.0'
+	id 'io.spring.dependency-management' version '1.1.0'
+}
+
+group = 'com.dvc_harness'
+sourceCompatibility = JavaVersion.VERSION_17
+targetCompatibility = JavaVersion.VERSION_17
+
+repositories {
+	mavenCentral()
+}
+
+jar {
+    archiveClassifier=''
+    enabled = false
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter'
+
+	if (System.getenv("JAVA_SDK_VERSION") != null && !System.getenv("JAVA_SDK_VERSION").isBlank()) {
+		// use a released version of the SDK from Maven Central
+		logger.info("Using released version of the SDK: ${System.getenv('JAVA_SDK_VERSION')}")
+		implementation("com.devcycle:java-server-sdk:${System.getenv('JAVA_SDK_VERSION')}")
+	} else if (System.getenv("SDK_GITHUB_SHA") != null && !System.getenv("SDK_GITHUB_SHA").isBlank()) {
+		logger.info("Using local copy of the SDK")
+		implementation project(':java-server-sdk')
+	} else if (System.getenv("LOCAL_MODE") != null && System.getenv("LOCAL_MODE") == "1") {
+		logger.info("Using local copy of the SDK")
+		implementation project(':java-server-sdk')
+	} else {
+		// utilize the latest release of the Java Server SDK
+		logger.info("Using latest release the SDK")
+		implementation("com.devcycle:java-server-sdk:latest.release")
+	}
+
+	// OpenFeature dependencies
+	implementation 'dev.openfeature:sdk:1.16.0'
+
+	implementation("org.springframework.boot:spring-boot-starter-web")
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+}

proxies/openfeature-java/gradlew

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+#!/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 "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# 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 "$JAVACMD" "$@"