feat: support yi ai model (#980)

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

@@ -64,6 +64,10 @@ Azure OpenAI 所对应的 `type` 为 `azure`。它特有的配置字段如下：
 
 通义千问所对应的 `type` 为 `qwen`。它并无特有的配置字段。
 
+#### 零一万物（Yi）
+
+零一万物所对应的 `type` 为 `yi`。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

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

@@ -20,6 +20,7 @@ const (
 	providerTypeQwen     = "qwen"
 	providerTypeOpenAI   = "openai"
 	providerTypeGroq     = "groq"
+	providerTypeYi       = "yi"
 
 	protocolOpenAI   = "openai"
 	protocolOriginal = "original"
@@ -53,6 +54,7 @@ var (
 		providerTypeQwen:     &qwenProviderInitializer{},
 		providerTypeOpenAI:   &openaiProviderInitializer{},
 		providerTypeGroq:     &groqProviderInitializer{},
+		providerTypeYi:       &yiProviderInitializer{},
 	}
 )
 

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

@@ -0,0 +1,85 @@
+package provider
+
+import (
+	"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 (
+	yiDomain             = "api.lingyiwanwu.com"
+	yiChatCompletionPath = "/v1/chat/completions"
+)
+
+type yiProviderInitializer struct {
+}
+
+func (m *yiProviderInitializer) ValidateConfig(config ProviderConfig) error {
+	return nil
+}
+
+func (m *yiProviderInitializer) CreateProvider(config ProviderConfig) (Provider, error) {
+	return &yiProvider{
+		config:       config,
+		contextCache: createContextCache(&config),
+	}, nil
+}
+
+type yiProvider struct {
+	config       ProviderConfig
+	contextCache *contextCache
+}
+
+func (m *yiProvider) GetProviderType() string {
+	return providerTypeYi
+}
+
+func (m *yiProvider) OnRequestHeaders(ctx wrapper.HttpContext, apiName ApiName, log wrapper.Log) (types.Action, error) {
+	if apiName != ApiNameChatCompletion {
+		return types.ActionContinue, errUnsupportedApiName
+	}
+	_ = util.OverwriteRequestPath(yiChatCompletionPath)
+	_ = util.OverwriteRequestHost(yiDomain)
+	_ = proxywasm.ReplaceHttpRequestHeader("Authorization", "Bearer "+m.config.GetRandomToken())
+
+	if m.contextCache == nil {
+		ctx.DontReadRequestBody()
+	} else {
+		_ = proxywasm.RemoveHttpRequestHeader("Content-Length")
+	}
+
+	return types.ActionContinue, nil
+}
+
+func (m *yiProvider) OnRequestBody(ctx wrapper.HttpContext, apiName ApiName, body []byte, log wrapper.Log) (types.Action, error) {
+	if apiName != ApiNameChatCompletion {
+		return types.ActionContinue, errUnsupportedApiName
+	}
+	if m.contextCache == nil {
+		return types.ActionContinue, nil
+	}
+	request := &chatCompletionRequest{}
+	if err := decodeChatCompletionRequest(body, request); err != nil {
+		return types.ActionContinue, err
+	}
+	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, util.MimeTypeTextPlain, fmt.Sprintf("failed to load context file: %v", err))
+		}
+		insertContextMessage(request, content)
+		if err := replaceJsonRequestBody(request, log); err != nil {
+			_ = util.SendResponse(500, util.MimeTypeTextPlain, fmt.Sprintf("failed to replace request body: %v", err))
+		}
+	}, log)
+	if err == nil {
+		return types.ActionPause, nil
+	}
+	return types.ActionContinue, err
+}