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/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
+}