🐛 fix: add PROXY_URL in docker with proxychains-ng (#3362)

* ✨: feat: support PROXY_URL in docker with proxychains-ng

* 🔨 chore: let proxychains config more readable

* 🔨 chore: add package update

* ⚡️ perf: add CN mirror for Alpine

* 🔨 chore: add more comments

* 🔨 chore: change USE_NPM_CN_MIRROR to USE_CN_MIRROR

* 🐛 fix: fix cn mirror for alpine during building

* 🐛 fix: fix permission issue

* 🐛 fix: fix app path error

* ✨ feat: support proxy server with domain

* 🔨 chore: add more comments & cleanup code

* 🔨 chore: add more comments

* ⚡️ perf: resolve only when host is domain

* 🔨 chore: move IP_REGEX to head

* 🔨 chore: replace `! -z` to `-n`

* 🔨 chore: update comments

* ✨ feat: add `DEFAULT_AGENT_CONFIG` and `SYSTEM_AGENT` to env, allow set default model

* Add documentation for `PROXY_URL` environment variable

Add documentation for `PROXY_URL` environment variable in both English and Chinese versions of the environment variables guide.

* **English Documentation**
  - Add `PROXY_URL` section to specify the proxy URL for connecting to external services.
  - Include example values and a callout for Docker Desktop users.

* **Chinese Documentation**
  - Add `PROXY_URL` section to specify the proxy URL for connecting to external services.
  - Include example values and a callout for Docker Desktop users.

---------

Co-authored-by: Arvin Xu <arvinx@foxmail.com>

Dockerfile

@@ -1,15 +1,27 @@
 ## Base image for all the stages
 FROM node:20-alpine AS base
 
+ARG USE_CN_MIRROR
+
 RUN \
+    # If you want to build docker in China, build with --build-arg USE_CN_MIRROR=true
+    if [ "${USE_CN_MIRROR:-false}" = "true" ]; then \
+        sed -i "s/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g" "/etc/apk/repositories"; \
+    fi \
+    # Add proxychains-ng package & update base package
+    && apk update \
+    && apk add --no-cache proxychains-ng \
+    && apk upgrade --no-cache \
     # Add user nextjs to run the app
-    addgroup --system --gid 1001 nodejs \
-    && adduser --system --uid 1001 nextjs
+    && addgroup --system --gid 1001 nodejs \
+    && adduser --system --uid 1001 nextjs \
+    && chown -R nextjs:nodejs "/etc/proxychains" \
+    && rm -rf /tmp/* /var/cache/apk/*
 
 ## Builder image, install all the dependencies and build the app
 FROM base AS builder
 
-ARG USE_NPM_CN_MIRROR
+ARG USE_CN_MIRROR
 
 ENV NEXT_PUBLIC_BASE_PATH=""
 
@@ -37,8 +49,8 @@ COPY package.json ./
 COPY .npmrc ./
 
 RUN \
-    # If you want to build docker in China, build with --build-arg USE_NPM_CN_MIRROR=true
-    if [ "${USE_NPM_CN_MIRROR:-false}" = "true" ]; then \
+    # If you want to build docker in China, build with --build-arg USE_CN_MIRROR=true
+    if [ "${USE_CN_MIRROR:-false}" = "true" ]; then \
         export SENTRYCLI_CDNURL="https://npmmirror.com/mirrors/sentry-cli"; \
         npm config set registry "https://registry.npmmirror.com/"; \
     fi \
@@ -85,7 +97,10 @@ ENV HOSTNAME="0.0.0.0" \
 # General Variables
 ENV ACCESS_CODE="" \
     API_KEY_SELECT_MODE="" \
-    FEATURE_FLAGS=""
+    DEFAULT_AGENT_CONFIG="" \
+    SYSTEM_AGENT="" \
+    FEATURE_FLAGS="" \
+    PROXY_URL=""
 
 # Model Variables
 ENV \
@@ -138,4 +153,36 @@ USER nextjs
 
 EXPOSE 3210/tcp
 
-CMD ["node", "/app/server.js"]
+CMD \
+    if [ -n "$PROXY_URL" ]; then \
+        # Set regex for IPv4
+        IP_REGEX="^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$"; \
+        # Set proxychains command
+        PROXYCHAINS="proxychains -q"; \
+        # Parse the proxy URL
+        host_with_port="${PROXY_URL#*//}"; \
+        host="${host_with_port%%:*}"; \
+        port="${PROXY_URL##*:}"; \
+        protocol="${PROXY_URL%%://*}"; \
+        # Resolve to IP address if the host is a domain
+        if ! [[ "$host" =~ "$IP_REGEX" ]]; then \
+            nslookup=$(nslookup -q="A" "$host" | tail -n +3 | grep 'Address:'); \
+            if [ -n "$nslookup" ]; then \
+                host=$(echo "$nslookup" | tail -n 1 | awk '{print $2}'); \
+            fi; \
+        fi; \
+        # Generate proxychains configuration file
+        printf "%s\n" \
+            'localnet 127.0.0.0/255.0.0.0' \
+            'localnet ::1/128' \
+            'proxy_dns' \
+            'remote_dns_subnet 224' \
+            'strict_chain' \
+            'tcp_connect_time_out 8000' \
+            'tcp_read_time_out 15000' \
+            '[ProxyList]' \
+            "$protocol $host $port" \
+        > "/etc/proxychains/proxychains.conf"; \
+    fi; \
+    # Run the server
+    ${PROXYCHAINS} node "/app/server.js";

docs/self-hosting/environment-variables/basic.mdx

@@ -80,6 +80,17 @@ Further reading:
 
 For specific content, please refer to the [Feature Flags](/docs/self-hosting/advanced/feature-flags) documentation.
 
+### `PROXY_URL`
+
+- Type: Optional
+- Description: Used to specify the proxy URL for connecting to external services. The value of this variable should be different in different deployment environments.
+- Default: -
+- Example: `http://127.0.0.1:7890` or `socks5://localhost:7891`
+
+<Callout type="info">
+If you're using Docker Desktop on Windows or macOS, it relies on a virtual machine. In this setup, `localhost` / `127.0.0.1` refers to the localhost of the container itself. In such cases, please try using `host.docker.internal` instead of `localhost`.
+</Callout>
+
 ## Plugin Service
 
 ### `PLUGINS_INDEX_URL`

docs/self-hosting/environment-variables/basic.zh-CN.mdx

@@ -76,6 +76,18 @@ LobeChat 在部署时提供了一些额外的配置项，你可以使用环境
 
 具体的内容可以参见 [特性标志](/zh/docs/self-hosting/advanced/feature-flags) 中的说明。
 
+### `PROXY_URL`
+
+- 类型：可选
+- 描述：用于指定连接到外部服务的代理 URL。该变量的值在不同的部署环境中应该有所不同。
+- 默认值：-
+- 示例：`http://127.0.0.1:7890` 或 `socks5://localhost:7891`
+
+
+<Callout type="info">
+`Docker Desktop` 在 `Windows `和 `macOS `上走的是虚拟机方案，如果是 `localhost` / `127.0.0.1` 是走到自身容器的 `localhost`，此时请尝试用 `host.docker.internal` 替代 `localhost`
+</Callout>
+
 ## 插件服务
 
 ### `PLUGINS_INDEX_URL`

package.json

@@ -54,7 +54,7 @@
     "pull": "git pull",
     "release": "semantic-release",
     "self-hosting:docker": "docker build -t lobe-chat:local .",
-    "self-hosting:docker-cn": "docker build -t lobe-chat:local --build-arg USE_NPM_CN_MIRROR=true .",
+    "self-hosting:docker-cn": "docker build -t lobe-chat:local --build-arg USE_CN_MIRROR=true .",
     "start": "next start -p 3210",
     "stylelint": "stylelint \"src/**/*.{js,jsx,ts,tsx}\" --fix",
     "test": "npm run test-app && npm run test-server",