|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "errors" |
| 5 | + "strings" |
| 6 | + |
| 7 | + "github.com/alibaba/higress/plugins/wasm-go/pkg/wrapper" |
| 8 | + "github.com/higress-group/proxy-wasm-go-sdk/proxywasm" |
| 9 | + "github.com/higress-group/proxy-wasm-go-sdk/proxywasm/types" |
| 10 | + "github.com/tidwall/gjson" |
| 11 | + "github.com/tidwall/sjson" |
| 12 | +) |
| 13 | + |
| 14 | +func main() { |
| 15 | + wrapper.SetCtx( |
| 16 | + "ai-prompt-decorator", |
| 17 | + wrapper.ParseConfigBy(parseConfig), |
| 18 | + wrapper.ProcessRequestHeadersBy(onHttpRequestHeaders), |
| 19 | + wrapper.ProcessRequestBodyBy(onHttpRequestBody), |
| 20 | + ) |
| 21 | +} |
| 22 | + |
| 23 | +type AIPromptDecoratorConfig struct { |
| 24 | + decorators map[string]string |
| 25 | +} |
| 26 | + |
| 27 | +func removeBrackets(raw string) (string, error) { |
| 28 | + startIndex := strings.Index(raw, "{") |
| 29 | + endIndex := strings.LastIndex(raw, "}") |
| 30 | + if startIndex == -1 || endIndex == -1 { |
| 31 | + return raw, errors.New("message format is wrong!") |
| 32 | + } else { |
| 33 | + return raw[startIndex : endIndex+1], nil |
| 34 | + } |
| 35 | +} |
| 36 | + |
| 37 | +func parseConfig(json gjson.Result, config *AIPromptDecoratorConfig, log wrapper.Log) error { |
| 38 | + config.decorators = make(map[string]string) |
| 39 | + for _, v := range json.Get("decorators").Array() { |
| 40 | + config.decorators[v.Get("name").String()] = v.Get("decorator").Raw |
| 41 | + // log.Info(v.Get("decorator").Raw) |
| 42 | + } |
| 43 | + return nil |
| 44 | +} |
| 45 | + |
| 46 | +func onHttpRequestHeaders(ctx wrapper.HttpContext, config AIPromptDecoratorConfig, log wrapper.Log) types.Action { |
| 47 | + decorator, _ := proxywasm.GetHttpRequestHeader("decorator") |
| 48 | + if decorator == "" { |
| 49 | + ctx.DontReadRequestBody() |
| 50 | + return types.ActionContinue |
| 51 | + } |
| 52 | + ctx.SetContext("decorator", decorator) |
| 53 | + proxywasm.RemoveHttpRequestHeader("decorator") |
| 54 | + proxywasm.RemoveHttpRequestHeader("content-length") |
| 55 | + return types.ActionContinue |
| 56 | +} |
| 57 | + |
| 58 | +func onHttpRequestBody(ctx wrapper.HttpContext, config AIPromptDecoratorConfig, body []byte, log wrapper.Log) types.Action { |
| 59 | + decoratorName := ctx.GetContext("decorator").(string) |
| 60 | + decorator := config.decorators[decoratorName] |
| 61 | + |
| 62 | + messageJson := `{"messages":[]}` |
| 63 | + |
| 64 | + prependMessage := gjson.Get(decorator, "prepend") |
| 65 | + if prependMessage.Exists() { |
| 66 | + for _, entry := range prependMessage.Array() { |
| 67 | + messageJson, _ = sjson.SetRaw(messageJson, "messages.-1", entry.Raw) |
| 68 | + } |
| 69 | + } |
| 70 | + |
| 71 | + rawMessage := gjson.GetBytes(body, "messages") |
| 72 | + if rawMessage.Exists() { |
| 73 | + for _, entry := range rawMessage.Array() { |
| 74 | + messageJson, _ = sjson.SetRaw(messageJson, "messages.-1", entry.Raw) |
| 75 | + } |
| 76 | + } |
| 77 | + |
| 78 | + appendMessage := gjson.Get(decorator, "append") |
| 79 | + if appendMessage.Exists() { |
| 80 | + for _, entry := range appendMessage.Array() { |
| 81 | + messageJson, _ = sjson.SetRaw(messageJson, "messages.-1", entry.Raw) |
| 82 | + } |
| 83 | + } |
| 84 | + |
| 85 | + newbody, err := sjson.SetRaw(string(body), "messages", gjson.Get(messageJson, "messages").Raw) |
| 86 | + if err != nil { |
| 87 | + log.Error("modify body failed") |
| 88 | + } |
| 89 | + if err = proxywasm.ReplaceHttpRequestBody([]byte(newbody)); err != nil { |
| 90 | + log.Error("rewrite body failed") |
| 91 | + } |
| 92 | + |
| 93 | + return types.ActionContinue |
| 94 | +} |
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