feat: AI 代理 Wasm 插件接入 Together AI (#1617)

plugins/wasm-go/extensions/ai-proxy/README.md

@@ -243,6 +243,9 @@ DeepL 所对应的 `type` 为 `deepl`。它特有的配置字段如下：
 
 Cohere 所对应的 `type` 为 `cohere`。它并无特有的配置字段。
 
+#### Together-AI
+Together-AI 所对应的 `type` 为 `together-ai`。它并无特有的配置字段。
+
 ## 用法示例
 
 ### 使用 OpenAI 协议代理 Azure OpenAI 服务
@@ -1496,6 +1499,61 @@ provider:
 }
 ```
 
+### 使用 OpenAI 协议代理 Together-AI 服务
+
+**配置信息**
+```yaml
+provider:
+  type: together-ai
+  apiTokens:
+    - "YOUR_TOGETHER_AI_API_TOKEN"
+  modelMapping:
+    "*": "Qwen/Qwen2.5-72B-Instruct-Turbo"
+```
+
+**请求示例**
+```json
+{
+    "model": "Qwen/Qwen2.5-72B-Instruct-Turbo",
+    "messages": [
+        {
+            "role": "user",
+            "content": "Who are you?"
+        }
+    ]
+}
+```
+
+**响应示例**
+```json
+{
+  "id": "8f5809d54b73efac",
+  "object": "chat.completion",
+  "created": 1734785851,
+  "model": "Qwen/Qwen2.5-72B-Instruct-Turbo",
+  "prompt": [],
+  "choices": [
+    {
+      "finish_reason": "eos",
+      "seed": 12830868308626506000,
+      "logprobs": null,
+      "index": 0,
+      "message": {
+        "role": "assistant",
+        "content": "I am Qwen, a large language model created by Alibaba Cloud. I am designed to assist users in generating various types of text, such as articles, stories, poems, and more, as well as answering questions and providing information on a wide range of topics. How can I assist you today?",
+        "tool_calls": []
+      }
+    }
+  ],
+  "usage": {
+    "prompt_tokens": 33,
+    "completion_tokens": 61,
+    "total_tokens": 94
+  }
+}
+```
+
+
 ## 完整配置示例
 
 ### Kubernetes 示例

plugins/wasm-go/extensions/ai-proxy/README_EN.md

@@ -1356,6 +1356,60 @@ Here, `model` denotes the service tier of DeepL and can only be either `Free` or
 }
 ```
 
+### Utilizing OpenAI Protocol Proxy for Together-AI Services
+
+**Configuration Information**
+```yaml
+provider:
+  type: together-ai
+  apiTokens:
+    - "YOUR_TOGETHER_AI_API_TOKEN"
+  modelMapping:
+    "*": "meta-llama/Meta-Llama-3.1-8B-Instruct-Turbo"
+```
+
+**Request Example**
+```json
+{
+    "model": "Qwen/Qwen2.5-72B-Instruct-Turbo",
+    "messages": [
+        {
+            "role": "user",
+            "content": "Who are you?"
+        }
+    ]
+}
+```
+
+**Response Example**
+```json
+{
+  "id": "8f5809d54b73efac",
+  "object": "chat.completion",
+  "created": 1734785851,
+  "model": "Qwen/Qwen2.5-72B-Instruct-Turbo",
+  "prompt": [],
+  "choices": [
+    {
+      "finish_reason": "eos",
+      "seed": 12830868308626506000,
+      "logprobs": null,
+      "index": 0,
+      "message": {
+        "role": "assistant",
+        "content": "I am Qwen, a large language model created by Alibaba Cloud. I am designed to assist users in generating various types of text, such as articles, stories, poems, and more, as well as answering questions and providing information on a wide range of topics. How can I assist you today?",
+        "tool_calls": []
+      }
+    }
+  ],
+  "usage": {
+    "prompt_tokens": 33,
+    "completion_tokens": 61,
+    "total_tokens": 94
+  }
+}
+```
+
 ## Full Configuration Example
 
 ### Kubernetes Example

plugins/wasm-go/extensions/ai-proxy/provider/provider.go

@@ -46,6 +46,7 @@ const (
 	providerTypeCohere     = "cohere"
 	providerTypeDoubao     = "doubao"
 	providerTypeCoze       = "coze"
+	providerTypeTogetherAI = "together-ai"
 
 	protocolOpenAI   = "openai"
 	protocolOriginal = "original"
@@ -106,6 +107,7 @@ var (
 		providerTypeCohere:     &cohereProviderInitializer{},
 		providerTypeDoubao:     &doubaoProviderInitializer{},
 		providerTypeCoze:       &cozeProviderInitializer{},
+		providerTypeTogetherAI: &togetherAIProviderInitializer{},
 	}
 )
 

plugins/wasm-go/extensions/ai-proxy/provider/together_ai.go

@@ -0,0 +1,69 @@
+package provider
+
+import (
+	"errors"
+	"github.com/alibaba/higress/plugins/wasm-go/extensions/ai-proxy/util"
+	"github.com/alibaba/higress/plugins/wasm-go/pkg/wrapper"
+	"github.com/higress-group/proxy-wasm-go-sdk/proxywasm/types"
+	"net/http"
+	"strings"
+)
+
+const (
+	togetherAIDomain         = "api.together.xyz"
+	togetherAICompletionPath = "/v1/chat/completions"
+)
+
+type togetherAIProviderInitializer struct{}
+
+func (m *togetherAIProviderInitializer) ValidateConfig(config ProviderConfig) error {
+	if config.apiTokens == nil || len(config.apiTokens) == 0 {
+		return errors.New("no apiToken found in provider config")
+	}
+	return nil
+}
+
+func (m *togetherAIProviderInitializer) CreateProvider(config ProviderConfig) (Provider, error) {
+	return &togetherAIProvider{
+		config:       config,
+		contextCache: createContextCache(&config),
+	}, nil
+}
+
+type togetherAIProvider struct {
+	config       ProviderConfig
+	contextCache *contextCache
+}
+
+func (m *togetherAIProvider) GetProviderType() string {
+	return providerTypeTogetherAI
+}
+
+func (m *togetherAIProvider) OnRequestHeaders(ctx wrapper.HttpContext, apiName ApiName, log wrapper.Log) error {
+	if apiName != ApiNameChatCompletion {
+		return errUnsupportedApiName
+	}
+	m.config.handleRequestHeaders(m, ctx, apiName, log)
+	return nil
+}
+
+func (m *togetherAIProvider) OnRequestBody(ctx wrapper.HttpContext, apiName ApiName, body []byte, log wrapper.Log) (types.Action, error) {
+	if apiName != ApiNameChatCompletion {
+		return types.ActionContinue, errUnsupportedApiName
+	}
+	return m.config.handleRequestBody(m, m.contextCache, ctx, apiName, body, log)
+}
+
+func (m *togetherAIProvider) TransformRequestHeaders(ctx wrapper.HttpContext, apiName ApiName, headers http.Header, log wrapper.Log) {
+	util.OverwriteRequestPathHeader(headers, togetherAICompletionPath)
+	util.OverwriteRequestHostHeader(headers, togetherAIDomain)
+	util.OverwriteRequestAuthorizationHeader(headers, "Bearer "+m.config.GetApiTokenInUse(ctx))
+	headers.Del("Content-Length")
+}
+
+func (m *togetherAIProvider) GetApiName(path string) ApiName {
+	if strings.Contains(path, togetherAICompletionPath) {
+		return ApiNameChatCompletion
+	}
+	return ""
+}