Add option to read swagger spec directly from URL

Author: Tradunsky

config/config.go

@@ -1,5 +1,5 @@
 /*
-Copyright (C) 2016-2017 dapperdox.com 
+Copyright (C) 2016-2017 dapperdox.com
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -30,6 +30,7 @@ type config struct {
 	BindAddr           string      `env:"BIND_ADDR" flag:"bind-addr" flagDesc:"Bind address"`
 	AssetsDir          string      `env:"ASSETS_DIR" flag:"assets-dir" flagDesc:"Assets to serve. Effectively the document root."`
 	DefaultAssetsDir   string      `env:"DEFAULT_ASSETS_DIR" flag:"default-assets-dir" flagDesc:"Default assets."`
+	SpecURL            string      `env:"SPEC_URL" flag:"spec-url" flagDesc:"OpenAPI specification (swagger) server url"`
 	SpecDir            string      `env:"SPEC_DIR" flag:"spec-dir" flagDesc:"OpenAPI specification (swagger) directory"`
 	SpecFilename       []string    `env:"SPEC_FILENAME" flag:"spec-filename" flagDesc:"The filename of the OpenAPI specification file within the spec-dir. May be multiply defined. Defaults to spec/swagger.json"`
 	Theme              string      `env:"THEME" flag:"theme" flagDesc:"Theme to render documentation"`
@@ -56,6 +57,7 @@ func Get() (*config, error) {
 	cfg = &config{
 		BindAddr:         "localhost:3123",
 		SpecDir:          "",
+		SpecURL:          "",
 		DefaultAssetsDir: "assets",
 		LogLevel:         "info",
 		SiteURL:          "http://localhost:3123/",

main.go

@@ -94,10 +94,18 @@ func main() {
 	specs.Register(router)
 	spec.LoadStatusCodes()
 
-	err = spec.LoadSpecifications(cfg.BindAddr, true)
-	if err != nil {
-		logger.Errorf(nil, "Load specification error: %s", err)
-		os.Exit(1)
+	if cfg.SpecURL != "" {
+		err = spec.LoadSpecification(cfg.SpecURL)
+		if err != nil {
+			logger.Errorf(nil, "Load specification error: %s", err)
+			os.Exit(1)
+		}
+	} else {
+		err = spec.LoadSpecifications(cfg.BindAddr, true)
+		if err != nil {
+			logger.Errorf(nil, "Load specification error: %s", err)
+			os.Exit(1)
+		}
 	}
 
 	render.Register()

spec/spec.go

@@ -293,6 +293,28 @@ func LoadSpecifications(specHost string, collapse bool) error {
 	return nil
 }
 
+func LoadSpecification(specUrl string) error {
+	if APISuite == nil {
+		APISuite = make(map[string]*APISpecification)
+	}
+
+	var ok bool
+	var specification *APISpecification
+
+	if specification, ok = APISuite[""]; !ok {
+		specification = &APISpecification{}
+	}
+
+	var err = specification.Load(specUrl, "")
+	if err != nil {
+		return err
+	}
+
+	APISuite[specification.ID] = specification
+
+	return nil
+}
+
 // -----------------------------------------------------------------------------
 // Load loads API specs from the supplied host (usually local!)
 func (c *APISpecification) Load(specLocation string, specHost string) error {
@@ -386,10 +408,10 @@ func (c *APISpecification) Load(specLocation string, specHost string) error {
 		// If we're grouping by TAGs, then build the API at the tag level
 		if groupingByTag {
 			api = &APIGroup{
-				ID:   TitleToKebab(name),
-				Name: name,
-				URL:  u,
-				Info: &c.APIInfo,
+				ID:                     TitleToKebab(name),
+				Name:                   name,
+				URL:                    u,
+				Info:                   &c.APIInfo,
 				MethodNavigationByName: methodNavByName,
 				MethodSortBy:           methodSortBy,
 				Consumes:               apispec.Consumes,
@@ -407,10 +429,10 @@ func (c *APISpecification) Load(specLocation string, specHost string) error {
 			// If not grouping by tag, then build the API at the path level
 			if !groupingByTag {
 				api = &APIGroup{
-					ID:   TitleToKebab(name),
-					Name: name,
-					URL:  u,
-					Info: &c.APIInfo,
+					ID:                     TitleToKebab(name),
+					Name:                   name,
+					URL:                    u,
+					Info:                   &c.APIInfo,
 					MethodNavigationByName: methodNavByName,
 					MethodSortBy:           methodSortBy,
 					Consumes:               apispec.Consumes,