feat: AI Proxy Wasm Plugin Integration with GitHub Models #1304 (#1362)

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

@@ -0,0 +1,112 @@
+package provider
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
+	"github.com/higress-group/proxy-wasm-go-sdk/proxywasm/types"
+
+	"github.com/alibaba/higress/plugins/wasm-go/extensions/ai-proxy/util"
+	"github.com/alibaba/higress/plugins/wasm-go/pkg/wrapper"
+)
+
+// githubProvider is the provider for GitHub OpenAI service.
+const (
+	githubDomain         = "models.inference.ai.azure.com"
+	githubCompletionPath = "/chat/completions"
+	githubEmbeddingPath  = "/embeddings"
+)
+
+type githubProviderInitializer struct {
+}
+
+type githubProvider struct {
+	config       ProviderConfig
+	contextCache *contextCache
+}
+
+func (m *githubProviderInitializer) 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 *githubProviderInitializer) CreateProvider(config ProviderConfig) (Provider, error) {
+	return &githubProvider{
+		config:       config,
+		contextCache: createContextCache(&config),
+	}, nil
+}
+
+func (m *githubProvider) GetProviderType() string {
+	return providerTypeGithub
+}
+
+func (m *githubProvider) OnRequestHeaders(ctx wrapper.HttpContext, apiName ApiName, log wrapper.Log) (types.Action, error) {
+	if apiName != ApiNameChatCompletion && apiName != ApiNameEmbeddings {
+		return types.ActionContinue, errUnsupportedApiName
+	}
+	_ = util.OverwriteRequestHost(githubDomain)
+	if apiName == ApiNameChatCompletion {
+		_ = util.OverwriteRequestPath(githubCompletionPath)
+	}
+	if apiName == ApiNameEmbeddings {
+		_ = util.OverwriteRequestPath(githubEmbeddingPath)
+	}
+	_ = proxywasm.RemoveHttpRequestHeader("Accept-Encoding")
+	_ = proxywasm.RemoveHttpRequestHeader("Content-Length")
+	_ = proxywasm.ReplaceHttpRequestHeader("Authorization", m.config.GetRandomToken())
+	// Delay the header processing to allow changing streaming mode in OnRequestBody
+	return types.HeaderStopIteration, nil
+}
+
+func (m *githubProvider) OnRequestBody(ctx wrapper.HttpContext, apiName ApiName, body []byte, log wrapper.Log) (types.Action, error) {
+	if apiName != ApiNameChatCompletion && apiName != ApiNameEmbeddings {
+		return types.ActionContinue, errUnsupportedApiName
+	}
+	if apiName == ApiNameChatCompletion {
+		return m.onChatCompletionRequestBody(ctx, body, log)
+	}
+	if apiName == ApiNameEmbeddings {
+		return m.onEmbeddingsRequestBody(ctx, body, log)
+	}
+	return types.ActionContinue, errUnsupportedApiName
+}
+
+func (m *githubProvider) onChatCompletionRequestBody(ctx wrapper.HttpContext, body []byte, log wrapper.Log) (types.Action, error) {
+	request := &chatCompletionRequest{}
+	if err := decodeChatCompletionRequest(body, request); err != nil {
+		return types.ActionContinue, err
+	}
+	if request.Model == "" {
+		return types.ActionContinue, errors.New("missing model in chat completion request")
+	}
+	// 映射模型
+	mappedModel := getMappedModel(request.Model, m.config.modelMapping, log)
+	if mappedModel == "" {
+		return types.ActionContinue, errors.New("model becomes empty after applying the configured mapping")
+	}
+	ctx.SetContext(ctxKeyFinalRequestModel, mappedModel)
+	request.Model = mappedModel
+	return types.ActionContinue, replaceJsonRequestBody(request, log)
+}
+
+func (m *githubProvider) onEmbeddingsRequestBody(ctx wrapper.HttpContext, body []byte, log wrapper.Log) (types.Action, error) {
+	request := &embeddingsRequest{}
+	if err := json.Unmarshal(body, request); err != nil {
+		return types.ActionContinue, fmt.Errorf("unable to unmarshal request: %v", err)
+	}
+	if request.Model == "" {
+		return types.ActionContinue, errors.New("missing model in embeddings request")
+	}
+	// 映射模型
+	mappedModel := getMappedModel(request.Model, m.config.modelMapping, log)
+	if mappedModel == "" {
+		return types.ActionContinue, errors.New("model becomes empty after applying the configured mapping")
+	}
+	ctx.SetContext(ctxKeyFinalRequestModel, mappedModel)
+	request.Model = mappedModel
+	return types.ActionContinue, replaceJsonRequestBody(request, log)
+}