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handle_request.go
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/
handle_request.go
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// Copyright 2023 Princess B33f Heavy Industries / Dave Shanley
// SPDX-License-Identifier: AGPL
package daemon
import (
_ "embed"
"fmt"
"github.com/pb33f/libopenapi-validator/errors"
"github.com/pb33f/libopenapi-validator/parameters"
"github.com/pb33f/libopenapi-validator/requests"
"github.com/pb33f/libopenapi-validator/responses"
"github.com/pb33f/ranch/model"
"github.com/pb33f/ranch/plank/utils"
configModel "github.com/pb33f/wiretap/config"
"github.com/pb33f/wiretap/shared"
"io"
"net/http"
"os"
"path/filepath"
"text/template"
"time"
)
//go:embed templates/socket-include.html
var staticTemplate string
type staticTemplateModel struct {
OriginalContent string
WebSocketPort string
}
func (ws *WiretapService) handleHttpRequest(request *model.Request) {
// determine if this is a request for a file or not.
if ws.config.StaticDir != "" {
fp := filepath.Join(ws.config.StaticDir, request.HttpRequest.URL.Path)
isRoot := false
// check if this is a static path catch-all
if len(ws.config.StaticPathsCompiled) > 0 {
for key := range ws.config.StaticPathsCompiled {
if ws.config.StaticPathsCompiled[key].Match(request.HttpRequest.URL.Path) {
fp = filepath.Join(ws.config.StaticDir, ws.config.StaticIndex)
isRoot = true
break
}
}
}
// check if this is a root request
if fp == ws.config.StaticDir {
isRoot = true
fp = filepath.Join(ws.config.StaticDir, "index.html")
}
localStat, _ := os.Stat(fp)
if localStat != nil {
if isRoot {
// if this root, we need to modify the index to inject some JS.
tmpFile, _ := os.CreateTemp("", "index.html")
defer os.Remove(tmpFile.Name())
tmpl, _ := template.New("index").Parse(staticTemplate)
indexBytes, _ := os.ReadFile(fp)
// prep a model
m := staticTemplateModel{
OriginalContent: string(indexBytes),
WebSocketPort: ws.config.WebSocketPort,
}
// execute the new template
tmpl.Execute(tmpFile, m)
// serve it.
http.ServeFile(request.HttpResponseWriter, request.HttpRequest, tmpFile.Name())
return
}
if !localStat.IsDir() {
http.ServeFile(request.HttpResponseWriter, request.HttpRequest, fp)
return
}
}
}
var returnedResponse *http.Response
var returnedError error
// create validators.
requestValidator := requests.NewRequestBodyValidator(ws.docModel)
paramValidator := parameters.NewParameterValidator(ws.docModel)
responseValidator := responses.NewResponseBodyValidator(ws.docModel)
configStore, _ := ws.controlsStore.Get(shared.ConfigKey)
config := configStore.(*shared.WiretapConfiguration)
if config.Headers == nil || len(config.Headers.DropHeaders) == 0 {
config.Headers = &shared.WiretapHeaderConfig{
DropHeaders: []string{},
}
}
var dropHeaders []string
var injectHeaders map[string]string
// add global headers with injection.
if config.Headers != nil {
dropHeaders = config.Headers.DropHeaders
injectHeaders = config.Headers.InjectHeaders
}
// now add path specific headers.
matchedPaths := configModel.FindPaths(request.HttpRequest.URL.Path, config)
auth := ""
if len(matchedPaths) > 0 {
for _, path := range matchedPaths {
auth = path.Auth
if path.Headers != nil {
dropHeaders = append(dropHeaders, path.Headers.DropHeaders...)
newInjectHeaders := path.Headers.InjectHeaders
for key := range injectHeaders {
newInjectHeaders[key] = injectHeaders[key]
}
injectHeaders = newInjectHeaders
}
break
}
}
newReq := cloneRequest(CloneRequest{
Request: request.HttpRequest,
Protocol: config.RedirectProtocol,
Host: config.RedirectHost,
Port: config.RedirectPort,
DropHeaders: dropHeaders,
InjectHeaders: injectHeaders,
Auth: auth,
Variables: config.CompiledVariables,
})
apiRequest := cloneRequest(CloneRequest{
Request: request.HttpRequest,
Protocol: config.RedirectProtocol,
Host: config.RedirectHost,
Port: config.RedirectPort,
DropHeaders: dropHeaders,
InjectHeaders: injectHeaders,
Auth: auth,
Variables: config.CompiledVariables,
})
var requestErrors []*errors.ValidationError
var responseErrors []*errors.ValidationError
// check if we're going to fail hard on validation errors. (default is to skip this)
if ws.config.HardErrors {
// validate the request synchronously
requestErrors = ws.validateRequest(request, newReq, requestValidator, paramValidator, responseValidator)
} else {
// validate the request asynchronously
go ws.validateRequest(request, newReq, requestValidator, paramValidator, responseValidator)
}
// call the API being requested.
returnedResponse, returnedError = ws.callAPI(apiRequest)
if returnedResponse == nil && returnedError != nil {
utils.Log.Infof("[wiretap] request %s: Failed (%d)", apiRequest.URL.String(), 500)
go ws.broadcastResponseError(request, cloneResponse(returnedResponse), returnedError)
request.HttpResponseWriter.WriteHeader(500)
wtError := shared.GenerateError("Unable to call API", 500, returnedError.Error(), "")
_, _ = request.HttpResponseWriter.Write(shared.MarshalError(wtError))
return
} else {
// check if we're going to fail hard on validation errors. (default is to skip this)
if ws.config.HardErrors {
// validate response
responseErrors = ws.validateResponse(request, responseValidator, cloneResponse(returnedResponse))
} else {
// validate response async
go ws.validateResponse(request, responseValidator, cloneResponse(returnedResponse))
}
}
// check if this path has a delay set.
delay := configModel.FindPathDelay(request.HttpRequest.URL.Path, config)
if delay > 0 {
time.Sleep(time.Duration(delay) * time.Millisecond) // simulate a slow response, configured for path.
} else {
if config.GlobalAPIDelay > 0 {
time.Sleep(time.Duration(config.GlobalAPIDelay) * time.Millisecond) // simulate a slow response.
}
}
body, _ := io.ReadAll(returnedResponse.Body)
headers := extractHeaders(returnedResponse)
// wiretap needs to work from anywhere, so allow everything.
headers["Access-Control-Allow-Headers"] = "*"
headers["Access-Control-Allow-Origin"] = "*"
headers["Access-Control-Allow-Methods"] = "OPTIONS,POST,GET,DELETE,PATCH,PUT"
// write headers
for k, v := range headers {
request.HttpResponseWriter.Header().Set(k, fmt.Sprint(v))
}
utils.Log.Infof("[wiretap] request %s: completed (%d)", request.HttpRequest.URL.String(), returnedResponse.StatusCode)
// if there are validation errors, set an error code
requestCode := config.HardErrorCode
returnCode := config.HardErrorReturnCode
switch {
case config.HardErrors && len(requestErrors) > 0 && len(responseErrors) <= 0:
request.HttpResponseWriter.WriteHeader(requestCode)
case config.HardErrors && len(requestErrors) <= 0 && len(responseErrors) > 0:
request.HttpResponseWriter.WriteHeader(returnCode)
case config.HardErrors && len(requestErrors) > 0 && len(responseErrors) > 0:
request.HttpResponseWriter.WriteHeader(returnCode)
default:
request.HttpResponseWriter.WriteHeader(returnedResponse.StatusCode)
}
_, _ = request.HttpResponseWriter.Write(body)
}