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

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 ""
+}