Ai proxy support doubao (#1337)

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

@@ -650,6 +650,19 @@ provider:
 }
 ```
 
+### 使用 OpenAI 协议代理豆包大模型服务
+
+**配置信息**
+
+```yaml
+provider:
+  type: doubao
+  apiTokens:
+    - YOUR_DOUBAO_API_KEY
+  modelMapping:
+    '*': YOUR_DOUBAO_ENDPOINT
+  timeout: 1200000
+```
 
 ### 使用月之暗面配合其原生的文件上下文
 

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

@@ -0,0 +1,102 @@
+package provider
+
+import (
+	"errors"
+	"fmt"
+
+	"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"
+	"github.com/higress-group/proxy-wasm-go-sdk/proxywasm/types"
+)
+
+const (
+	doubaoDomain             = "ark.cn-beijing.volces.com"
+	doubaoChatCompletionPath = "/api/v3/chat/completions"
+)
+
+type doubaoProviderInitializer struct{}
+
+func (m *doubaoProviderInitializer) 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 *doubaoProviderInitializer) CreateProvider(config ProviderConfig) (Provider, error) {
+	return &doubaoProvider{
+		config:       config,
+		contextCache: createContextCache(&config),
+	}, nil
+}
+
+type doubaoProvider struct {
+	config       ProviderConfig
+	contextCache *contextCache
+}
+
+func (m *doubaoProvider) GetProviderType() string {
+	return providerTypeDoubao
+}
+
+func (m *doubaoProvider) OnRequestHeaders(ctx wrapper.HttpContext, apiName ApiName, log wrapper.Log) (types.Action, error) {
+	_ = util.OverwriteRequestHost(doubaoDomain)
+	_ = util.OverwriteRequestAuthorization("Bearer " + m.config.GetRandomToken())
+	_ = proxywasm.RemoveHttpRequestHeader("Content-Length")
+	if m.config.protocol == protocolOriginal {
+		ctx.DontReadRequestBody()
+		return types.ActionContinue, nil
+	}
+	if apiName != ApiNameChatCompletion {
+		return types.ActionContinue, errUnsupportedApiName
+	}
+	_ = util.OverwriteRequestPath(doubaoChatCompletionPath)
+	return types.ActionContinue, nil
+}
+
+func (m *doubaoProvider) OnRequestBody(ctx wrapper.HttpContext, apiName ApiName, body []byte, log wrapper.Log) (types.Action, error) {
+	if apiName != ApiNameChatCompletion {
+		return types.ActionContinue, errUnsupportedApiName
+	}
+	request := &chatCompletionRequest{}
+	if err := decodeChatCompletionRequest(body, request); err != nil {
+		return types.ActionContinue, err
+	}
+	model := request.Model
+	if model == "" {
+		return types.ActionContinue, errors.New("missing model in chat completion request")
+	}
+	mappedModel := getMappedModel(model, m.config.modelMapping, log)
+	if mappedModel == "" {
+		return types.ActionContinue, errors.New("model becomes empty after applying the configured mapping")
+	}
+	request.Model = mappedModel
+	if m.contextCache != nil {
+		err := m.contextCache.GetContent(func(content string, err error) {
+			defer func() {
+				_ = proxywasm.ResumeHttpRequest()
+			}()
+			if err != nil {
+				log.Errorf("failed to load context file: %v", err)
+				_ = util.SendResponse(500, "ai-proxy.doubao.load_ctx_failed", util.MimeTypeTextPlain, fmt.Sprintf("failed to load context file: %v", err))
+			}
+			insertContextMessage(request, content)
+			if err := replaceJsonRequestBody(request, log); err != nil {
+				_ = util.SendResponse(500, "ai-proxy.doubao.insert_ctx_failed", util.MimeTypeTextPlain, fmt.Sprintf("failed to replace request body: %v", err))
+			}
+		}, log)
+		if err == nil {
+			return types.ActionPause, nil
+		} else {
+			return types.ActionContinue, err
+		}
+	} else {
+		if err := replaceJsonRequestBody(request, log); err != nil {
+			_ = util.SendResponse(500, "ai-proxy.doubao.transform_body_failed", util.MimeTypeTextPlain, fmt.Sprintf("failed to replace request body: %v", err))
+			return types.ActionContinue, err
+		}
+		_ = proxywasm.ResumeHttpRequest()
+		return types.ActionPause, nil
+	}
+}

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

@@ -39,6 +39,7 @@ const (
 	providerTypeDeepl      = "deepl"
 	providerTypeMistral    = "mistral"
 	providerTypeCohere     = "cohere"
+	providerTypeDoubao     = "doubao"
 
 	protocolOpenAI   = "openai"
 	protocolOriginal = "original"
@@ -96,6 +97,7 @@ var (
 		providerTypeDeepl:      &deeplProviderInitializer{},
 		providerTypeMistral:    &mistralProviderInitializer{},
 		providerTypeCohere:     &cohereProviderInitializer{},
+		providerTypeDoubao:     &doubaoProviderInitializer{},
 	}
 )