feat: Add the ZhipuAI (ChatGLM) provider to the ai-proxy wasm plugin #950 (#1007)

Co-authored-by: Kent Dong <ch3cho@qq.com>

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

@@ -23,6 +23,7 @@ const (
 	providerTypeBaichuan = "baichuan"
 	providerTypeYi       = "yi"
 	providerTypeDeepSeek = "deepseek"
+	providerTypeZhipuAi  = "zhipuai"
 	providerTypeOllama   = "ollama"
 
 	protocolOpenAI   = "openai"
@@ -61,6 +62,7 @@ var (
 		providerTypeBaichuan: &baichuanProviderInitializer{},
 		providerTypeYi:       &yiProviderInitializer{},
 		providerTypeDeepSeek: &deepseekProviderInitializer{},
+		providerTypeZhipuAi:  &zhipuAiProviderInitializer{},
 		providerTypeOllama:   &ollamaProviderInitializer{},
 	}
 )
@@ -91,7 +93,7 @@ type ResponseBodyHandler interface {
 
 type ProviderConfig struct {
 	// @Title zh-CN AI服务提供商
-	// @Description zh-CN AI服务提供商类型，目前支持的取值为："moonshot"、"qwen"、"openai"、"azure"、"baichuan"、"yi"、"ollama"
+	// @Description zh-CN AI服务提供商类型，目前支持的取值为："moonshot"、"qwen"、"openai"、"azure"、"baichuan"、"yi"、"zhipuai"、"ollama"
 	typ string `required:"true" yaml:"type" json:"type"`
 	// @Title zh-CN API Tokens
 	// @Description zh-CN 在请求AI服务时用于认证的API Token列表。不同的AI服务提供商可能有不同的名称。部分供应商只支持配置一个API Token（如Azure OpenAI）。
@@ -180,6 +182,7 @@ func (c *ProviderConfig) Validate() error {
 
 	if c.typ == "" {
 		return errors.New("missing type in provider config")
+    
 	}
 	initializer, has := providerInitializers[c.typ]
 	if !has {

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

@@ -0,0 +1,84 @@
+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 (
+	zhipuAiDomain             = "open.bigmodel.cn"
+	zhipuAiChatCompletionPath = "/api/paas/v4/chat/completions"
+)
+
+type zhipuAiProviderInitializer struct{}
+
+func (m *zhipuAiProviderInitializer) ValidateConfig(config ProviderConfig) error {
+	return nil
+}
+
+func (m *zhipuAiProviderInitializer) CreateProvider(config ProviderConfig) (Provider, error) {
+	return &zhipuAiProvider{
+		config:       config,
+		contextCache: createContextCache(&config),
+	}, nil
+}
+
+type zhipuAiProvider struct {
+	config       ProviderConfig
+	contextCache *contextCache
+}
+
+func (m *zhipuAiProvider) GetProviderType() string {
+	return providerTypeZhipuAi
+}
+
+func (m *zhipuAiProvider) OnRequestHeaders(ctx wrapper.HttpContext, apiName ApiName, log wrapper.Log) (types.Action, error) {
+	if apiName != ApiNameChatCompletion {
+		return types.ActionContinue, errUnsupportedApiName
+	}
+	_ = util.OverwriteRequestPath(zhipuAiChatCompletionPath)
+	_ = util.OverwriteRequestHost(zhipuAiDomain)
+	_ = proxywasm.ReplaceHttpRequestHeader("Authorization", "Bearer "+m.config.GetRandomToken())
+
+	if m.contextCache == nil {
+		ctx.DontReadRequestBody()
+	} else {
+		_ = proxywasm.RemoveHttpRequestHeader("Content-Length")
+	}
+
+	return types.ActionContinue, nil
+}
+
+func (m *zhipuAiProvider) 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
+}