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mark.george
/
httpcat
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Fix 404, and add wildcard mode.
Closes
#8
and
#6
.
1 parent
b576de2
commit
d6c8be812e25e887633565e3fba69f273367518c
Mark George
authored
on 12 May 2022
Patch
Showing
1 changed file
src/server.go
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src/server.go
/** Author: Mark George <mark.george@otago.ac.nz> License: Zero-Clause BSD License */ package main import ( "fmt" "net/http" "os" "strconv" ) type ServerCommand struct { Port int `short:"p" long:"port" description:"Port to listen on." default:"8080"` Routes []string `short:"r" long:"route" description:"Route which is made up of a path, a response body, and a response status, all separated by the pipe '|' character. Repeat for additional routes."` Cors bool `short:"c" long:"cors" description:"Enable Cross Origin Resource Sharing (CORS). Allows all requested methods and headers."` Headers []string `short:"H" long:"header" description:"A header to add to response in the form name:value. Use multiple times for multiple headers."` } var ( serverOptions *ServerCommand ) func (opts *ServerCommand) Execute(args []string) error { serverOptions = opts // parse custom headers if provided if len(opts.Headers) > 0 { for _, header := range opts.Headers { if _, _, err := parseHeader(header); err != nil { fmt.Println("The following header is not in the correct format: " + header + "\nCorrect format is: 'name:value'") os.Exit(1) } } } fmt.Println("HTTP server listening on port " + strconv.Itoa(opts.Port) + "\n") if len(opts.Routes) > 0 { fmt.Println("Routes:") for _, route := range opts.Routes { if path, _, _, err := parseRoute(route); err == nil { fmt.Println(" " + path) http.HandleFunc(path, serverRequestHandler) } else { fmt.Println("The following route is not in the correct format: " + route + "\nCorrect format is: \"/path|response body|status code\"") os.Exit(1) } } fmt.Println() } else { // wildcard mode http.HandleFunc("/", serverRequestHandler) } if err := http.ListenAndServe(":"+strconv.Itoa(opts.Port), nil); err != nil { fmt.Fprintf(os.Stderr, "Could not start server. Is port %d available?\n", opts.Port) os.Exit(1) } return nil } func serverRequestHandler(rsp http.ResponseWriter, req *http.Request) { path := req.RequestURI body := bodies[path] code := statuses[path] // are we in wildcard mode? if code == 0 && len(statuses) == 0 { if req.Method == http.MethodGet { code = 200 } else { code = 204 } } showRequest(req) // CORS preflight if serverOptions.Cors && req.Method == http.MethodOptions { // was the OPTIONS request actually a CORS request? if secFetchMode := req.Header.Get("Sec-Fetch-Mode"); secFetchMode == "cors" { if globalOptions.Verbose { fmt.Println("Responding to CORS preflight") } if origin := req.Header.Get("Origin"); origin != "" { if globalOptions.Verbose { fmt.Println("Adding CORS response header - Access-Control-Allow-Origin: " + origin) } // allow the origin rsp.Header().Set("Access-Control-Allow-Origin", origin) if headers := req.Header.Get("Access-Control-Request-Headers"); headers != "" { if globalOptions.Verbose { fmt.Println("Adding CORS response header - Access-Control-Allow-Headers: " + headers) } // allow any requested headers rsp.Header().Set("Access-Control-Allow-Headers", headers) } if method := req.Header.Get("Access-Control-Request-Method"); method != "" { if globalOptions.Verbose { fmt.Println("Adding CORS response header - Access-Control-Allow-Methods: " + method) } // allow any requested methods rsp.Header().Set("Access-Control-Allow-Methods", method) } if globalOptions.Verbose { fmt.Println("Adding CORS response header - Access-Control-Max-Age: " + "600") } // allow browser to reuse the permissions for 10 minutes rsp.Header().Set("Access-Control-Max-Age", "600") rsp.WriteHeader(200) return } else { if globalOptions.Verbose { fmt.Println("CORS preflight did not contain 'Origin' header!") } rsp.Header().Set("Content-Type", "text/plain") rsp.WriteHeader(400) fmt.Fprint(rsp, "Origin header was not provided") return } } } // add custom headers if provided if len(serverOptions.Headers) > 0 { for name, value := range headers { if globalOptions.Verbose { fmt.Println("Adding response header - " + name + ": " + value) } rsp.Header().Set(name, value) } } // add CORS allow-origin header if serverOptions.Cors && req.Method != http.MethodOptions { if origin := req.Header.Get("Origin"); origin != "" { if globalOptions.Verbose { fmt.Println("Adding CORS response header - Access-Control-Allow-Origin: " + origin) } rsp.Header().Set("Access-Control-Allow-Origin", origin) } } // add status line rsp.WriteHeader(code) // add body fmt.Fprint(rsp, body) }
/** Author: Mark George <mark.george@otago.ac.nz> License: Zero-Clause BSD License */ package main import ( "fmt" "net/http" "os" "strconv" ) type ServerCommand struct { Port int `short:"p" long:"port" description:"Port to listen on." default:"8080"` Routes []string `short:"r" long:"route" description:"Route which is made up of a path, a response body, and a response status, all separated by the pipe '|' character. Repeat for additional routes." default:"/|testing 123|200"` Cors bool `short:"c" long:"cors" description:"Enable Cross Origin Resource Sharing (CORS). Allows all requested methods and headers."` Headers []string `short:"H" long:"header" description:"A header to add to response in the form name:value. Use multiple times for multiple headers."` } var ( serverOptions *ServerCommand ) func (opts *ServerCommand) Execute(args []string) error { serverOptions = opts // parse custom headers if provided if len(opts.Headers) > 0 { for _, header := range opts.Headers { if _, _, err := parseHeader(header); err != nil { fmt.Println("The following header is not in the correct format: " + header + "\nCorrect format is: 'name:value'") os.Exit(1) } } } fmt.Println("HTTP server listening on port " + strconv.Itoa(opts.Port) + "\n") if len(opts.Routes) > 0 { fmt.Println("Routes:") for _, route := range opts.Routes { if path, _, _, err := parseRoute(route); err == nil { fmt.Println(" " + path) http.HandleFunc(path, serverRequestHandler) } else { fmt.Println("The following route is not in the correct format: " + route + "\nCorrect format is: \"/path|response body|status code\"") os.Exit(1) } } fmt.Println() } if err := http.ListenAndServe(":"+strconv.Itoa(opts.Port), nil); err != nil { fmt.Fprintf(os.Stderr, "Could not start server. Is port %d available?\n", opts.Port) os.Exit(1) } return nil } func serverRequestHandler(rsp http.ResponseWriter, req *http.Request) { path := req.RequestURI body := bodies[path] code := statuses[path] showRequest(req) // CORS preflight if serverOptions.Cors && req.Method == http.MethodOptions { // was the OPTIONS request actually a CORS request? if secFetchMode := req.Header.Get("Sec-Fetch-Mode"); secFetchMode == "cors" { if globalOptions.Verbose { fmt.Println("Responding to CORS preflight") } if origin := req.Header.Get("Origin"); origin != "" { if globalOptions.Verbose { fmt.Println("Adding CORS response header - Access-Control-Allow-Origin: " + origin) } // allow the origin rsp.Header().Set("Access-Control-Allow-Origin", origin) if headers := req.Header.Get("Access-Control-Request-Headers"); headers != "" { if globalOptions.Verbose { fmt.Println("Adding CORS response header - Access-Control-Allow-Headers: " + headers) } // allow any requested headers rsp.Header().Set("Access-Control-Allow-Headers", headers) } if method := req.Header.Get("Access-Control-Request-Method"); method != "" { if globalOptions.Verbose { fmt.Println("Adding CORS response header - Access-Control-Allow-Methods: " + method) } // allow any requested methods rsp.Header().Set("Access-Control-Allow-Methods", method) } if globalOptions.Verbose { fmt.Println("Adding CORS response header - Access-Control-Max-Age: " + "600") } // allow browser to reuse the permissions for 10 minutes rsp.Header().Set("Access-Control-Max-Age", "600") rsp.WriteHeader(200) return } else { if globalOptions.Verbose { fmt.Println("CORS preflight did not contain 'Origin' header!") } rsp.Header().Set("Content-Type", "text/plain") rsp.WriteHeader(400) fmt.Fprint(rsp, "Origin header was not provided") return } } } // add custom headers if provided if len(serverOptions.Headers) > 0 { for name, value := range headers { if globalOptions.Verbose { fmt.Println("Adding response header - " + name + ": " + value) } rsp.Header().Set(name, value) } } // add CORS allow-origin header if serverOptions.Cors && req.Method != http.MethodOptions { if origin := req.Header.Get("Origin"); origin != "" { if globalOptions.Verbose { fmt.Println("Adding CORS response header - Access-Control-Allow-Origin: " + origin) } rsp.Header().Set("Access-Control-Allow-Origin", origin) } } // add status line rsp.WriteHeader(code) // add body fmt.Fprint(rsp, body) }
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