Add ai search plugin (#1804)

plugins/wasm-go/extensions/ai-search/engine/google/google.go

@@ -0,0 +1,120 @@
+package google
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/alibaba/higress/plugins/wasm-go/pkg/wrapper"
+	"github.com/tidwall/gjson"
+
+	"github.com/alibaba/higress/plugins/wasm-go/extensions/ai-search/engine"
+)
+
+type GoogleSearch struct {
+	optionArgs         map[string]string
+	apiKey             string
+	cx                 string
+	start              int
+	count              int
+	timeoutMillisecond uint32
+	client             wrapper.HttpClient
+}
+
+func NewGoogleSearch(config *gjson.Result) (*GoogleSearch, error) {
+	engine := &GoogleSearch{}
+	engine.apiKey = config.Get("apiKey").String()
+	if engine.apiKey == "" {
+		return nil, errors.New("apiKey not found")
+	}
+	engine.cx = config.Get("cx").String()
+	if engine.cx == "" {
+		return nil, errors.New("cx not found")
+	}
+	serviceName := config.Get("serviceName").String()
+	if serviceName == "" {
+		return nil, errors.New("serviceName not found")
+	}
+	servicePort := config.Get("servicePort").Int()
+	if servicePort == 0 {
+		return nil, errors.New("servicePort not found")
+	}
+	engine.client = wrapper.NewClusterClient(wrapper.FQDNCluster{
+		FQDN: serviceName,
+		Port: servicePort,
+	})
+	engine.start = int(config.Get("start").Uint())
+	engine.count = int(config.Get("count").Uint())
+	if engine.count == 0 {
+		engine.count = 10
+	}
+	if engine.count > 10 || engine.start+engine.count > 100 {
+		return nil, errors.New("count must be less than 10, and start + count must be less than or equal to 100.")
+	}
+	engine.timeoutMillisecond = uint32(config.Get("timeoutMillisecond").Uint())
+	if engine.timeoutMillisecond == 0 {
+		engine.timeoutMillisecond = 5000
+	}
+	engine.optionArgs = map[string]string{}
+	for key, value := range config.Get("optionArgs").Map() {
+		valStr := value.String()
+		if valStr != "" {
+			engine.optionArgs[key] = value.String()
+		}
+	}
+	return engine, nil
+}
+
+func (g GoogleSearch) NeedExectue(ctx engine.SearchContext) bool {
+	return ctx.EngineType == "internet"
+}
+
+func (g GoogleSearch) Client() wrapper.HttpClient {
+	return g.client
+}
+
+func (g GoogleSearch) CallArgs(ctx engine.SearchContext) engine.CallArgs {
+	queryUrl := fmt.Sprintf("https://customsearch.googleapis.com/customsearch/v1?cx=%s&q=%s&num=%d&key=%s&start=%d",
+		g.cx, url.QueryEscape(strings.Join(ctx.Querys, " ")), g.count, g.apiKey, g.start+1)
+	var extraArgs []string
+	for key, value := range g.optionArgs {
+		extraArgs = append(extraArgs, fmt.Sprintf("%s=%s", key, url.QueryEscape(value)))
+	}
+	if ctx.Language != "" {
+		extraArgs = append(extraArgs, fmt.Sprintf("lr=lang_%s", ctx.Language))
+	}
+	if len(extraArgs) > 0 {
+		queryUrl = fmt.Sprintf("%s&%s", queryUrl, strings.Join(extraArgs, "&"))
+	}
+	return engine.CallArgs{
+		Method: http.MethodGet,
+		Url:    queryUrl,
+		Headers: [][2]string{
+			{"Accept", "application/json"},
+		},
+		TimeoutMillisecond: g.timeoutMillisecond,
+	}
+}
+
+func (g GoogleSearch) ParseResult(ctx engine.SearchContext, response []byte) []engine.SearchResult {
+	jsonObj := gjson.ParseBytes(response)
+	var results []engine.SearchResult
+	for _, item := range jsonObj.Get("items").Array() {
+		content := item.Get("snippet").String()
+		metaDescription := item.Get("pagemap.metatags.0.og:description").String()
+		if metaDescription != "" {
+			content = fmt.Sprintf("%s\n...\n%s", content, metaDescription)
+		}
+		result := engine.SearchResult{
+			Title:   item.Get("title").String(),
+			Link:    item.Get("link").String(),
+			Content: content,
+		}
+		if result.Valid() {
+			results = append(results, result)
+		}
+	}
+	return results
+}