vendor dependencies with dep

vendor/github.com/go-chi/cors/README.md

@@ -0,0 +1,32 @@
+# CORS net/http middleware
+
+(fork of github.com/rs/cors)
+
+## Usage
+
+```go
+func main() {
+  r := chi.NewRouter()
+
+  // Basic CORS
+  // for more ideas, see: https://developer.github.com/v3/#cross-origin-resource-sharing
+  cors := cors.New(cors.Options{
+    // AllowedOrigins: []string{"https://foo.com"}, // Use this to allow specific origin hosts
+    AllowedOrigins:   []string{"*"},
+    // AllowOriginFunc:  func(r *http.Request, origin string) bool { return true },
+    AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+    AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
+    ExposedHeaders:   []string{"Link"},
+    AllowCredentials: true,
+    MaxAge:           300, // Maximum value not ignored by any of major browsers
+  })
+  r.Use(cors.Handler)
+  
+  r.Get("/", func(w http.ResponseWriter, r *http.Request) {
+    w.Write([]byte("welcome"))
+  })
+  
+  http.ListenAndServe(":3000", r)
+}
+```
+

vendor/github.com/go-chi/cors/_example/main.go

@@ -0,0 +1,84 @@
+// cors example
+//
+// ie.
+//
+// Unsuccessful Preflight request:
+// ===============================
+// $ curl -i http://localhost:3000/ -H "Origin: http://no.com" -H "Access-Control-Request-Method: GET" -X OPTIONS
+// HTTP/1.1 200 OK
+// Vary: Origin
+// Vary: Access-Control-Request-Method
+// Vary: Access-Control-Request-Headers
+// Date: Fri, 28 Jul 2017 17:55:47 GMT
+// Content-Length: 0
+// Content-Type: text/plain; charset=utf-8
+//
+//
+// Successful Preflight request:
+// =============================
+// $ curl -i http://localhost:3000/ -H "Origin: http://example.com" -H "Access-Control-Request-Method: GET" -X OPTIONS
+// HTTP/1.1 200 OK
+// Access-Control-Allow-Credentials: true
+// Access-Control-Allow-Methods: GET
+// Access-Control-Allow-Origin: http://example.com
+// Access-Control-Max-Age: 300
+// Vary: Origin
+// Vary: Access-Control-Request-Method
+// Vary: Access-Control-Request-Headers
+// Date: Fri, 28 Jul 2017 17:56:44 GMT
+// Content-Length: 0
+// Content-Type: text/plain; charset=utf-8
+//
+//
+// Content request (after a successful preflight):
+// ===============================================
+// $ curl -i http://localhost:3000/ -H "Origin: http://example.com"
+// HTTP/1.1 200 OK
+// Access-Control-Allow-Credentials: true
+// Access-Control-Allow-Origin: http://example.com
+// Access-Control-Expose-Headers: Link
+// Vary: Origin
+// Date: Fri, 28 Jul 2017 17:57:52 GMT
+// Content-Length: 7
+// Content-Type: text/plain; charset=utf-8
+//
+// welcome%
+//
+package main
+
+import (
+	"net/http"
+
+	"github.com/go-chi/chi"
+	"github.com/go-chi/cors"
+)
+
+func main() {
+	r := chi.NewRouter()
+
+	// Basic CORS
+	// for more ideas, see: https://developer.github.com/v3/#cross-origin-resource-sharing
+	cors := cors.New(cors.Options{
+		AllowOriginFunc:  AllowOriginFunc,
+		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
+		ExposedHeaders:   []string{"Link"},
+		AllowCredentials: true,
+		MaxAge:           300, // Maximum value not ignored by any of major browsers
+	})
+	r.Use(cors.Handler)
+
+	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("welcome"))
+	})
+
+	http.ListenAndServe(":3000", r)
+}
+
+func AllowOriginFunc(r *http.Request, origin string) bool {
+	if origin == "http://example.com" {
+		return true
+	}
+
+	return false
+}

vendor/github.com/go-chi/cors/cors.go

@@ -0,0 +1,369 @@
+// cors package is net/http handler to handle CORS related requests
+// as defined by http://www.w3.org/TR/cors/
+//
+// You can configure it by passing an option struct to cors.New:
+//
+//     c := cors.New(cors.Options{
+//         AllowedOrigins: []string{"foo.com"},
+//         AllowedMethods: []string{"GET", "POST", "DELETE"},
+//         AllowCredentials: true,
+//     })
+//
+// Then insert the handler in the chain:
+//
+//     handler = c.Handler(handler)
+//
+// See Options documentation for more options.
+//
+// The resulting handler is a standard net/http handler.
+package cors
+
+import (
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// Options is a configuration container to setup the CORS middleware.
+type Options struct {
+	// AllowedOrigins is a list of origins a cross-domain request can be executed from.
+	// If the special "*" value is present in the list, all origins will be allowed.
+	// An origin may contain a wildcard (*) to replace 0 or more characters
+	// (i.e.: http://*.domain.com). Usage of wildcards implies a small performance penality.
+	// Only one wildcard can be used per origin.
+	// Default value is ["*"]
+	AllowedOrigins []string
+
+	// AllowOriginFunc is a custom function to validate the origin. It take the origin
+	// as argument and returns true if allowed or false otherwise. If this option is
+	// set, the content of AllowedOrigins is ignored.
+	AllowOriginFunc func(r *http.Request, origin string) bool
+
+	// AllowedMethods is a list of methods the client is allowed to use with
+	// cross-domain requests. Default value is simple methods (GET and POST)
+	AllowedMethods []string
+
+	// AllowedHeaders is list of non simple headers the client is allowed to use with
+	// cross-domain requests.
+	// If the special "*" value is present in the list, all headers will be allowed.
+	// Default value is [] but "Origin" is always appended to the list.
+	AllowedHeaders []string
+
+	// ExposedHeaders indicates which headers are safe to expose to the API of a CORS
+	// API specification
+	ExposedHeaders []string
+
+	// AllowCredentials indicates whether the request can include user credentials like
+	// cookies, HTTP authentication or client side SSL certificates.
+	AllowCredentials bool
+
+	// MaxAge indicates how long (in seconds) the results of a preflight request
+	// can be cached
+	MaxAge int
+
+	// OptionsPassthrough instructs preflight to let other potential next handlers to
+	// process the OPTIONS method. Turn this on if your application handles OPTIONS.
+	OptionsPassthrough bool
+
+	// Debugging flag adds additional output to debug server side CORS issues
+	Debug bool
+}
+
+// Cors http handler
+type Cors struct {
+	// Debug logger
+	log *log.Logger
+
+	// Set to true when allowed origins contains a "*"
+	allowedOriginsAll bool
+
+	// Normalized list of plain allowed origins
+	allowedOrigins []string
+
+	// List of allowed origins containing wildcards
+	allowedWOrigins []wildcard
+
+	// Optional origin validator function
+	allowOriginFunc func(r *http.Request, origin string) bool
+
+	// Set to true when allowed headers contains a "*"
+	allowedHeadersAll bool
+
+	// Normalized list of allowed headers
+	allowedHeaders []string
+
+	// Normalized list of allowed methods
+	allowedMethods []string
+
+	// Normalized list of exposed headers
+	exposedHeaders    []string
+	allowCredentials  bool
+	maxAge            int
+	optionPassthrough bool
+}
+
+// New creates a new Cors handler with the provided options.
+func New(options Options) *Cors {
+	c := &Cors{
+		exposedHeaders:    convert(options.ExposedHeaders, http.CanonicalHeaderKey),
+		allowOriginFunc:   options.AllowOriginFunc,
+		allowCredentials:  options.AllowCredentials,
+		maxAge:            options.MaxAge,
+		optionPassthrough: options.OptionsPassthrough,
+	}
+	if options.Debug {
+		c.log = log.New(os.Stdout, "[cors] ", log.LstdFlags)
+	}
+
+	// Normalize options
+	// Note: for origins and methods matching, the spec requires a case-sensitive matching.
+	// As it may error prone, we chose to ignore the spec here.
+
+	// Allowed Origins
+	if len(options.AllowedOrigins) == 0 {
+		// Default is all origins
+		c.allowedOriginsAll = true
+	} else {
+		c.allowedOrigins = []string{}
+		c.allowedWOrigins = []wildcard{}
+		for _, origin := range options.AllowedOrigins {
+			// Normalize
+			origin = strings.ToLower(origin)
+			if origin == "*" {
+				// If "*" is present in the list, turn the whole list into a match all
+				c.allowedOriginsAll = true
+				c.allowedOrigins = nil
+				c.allowedWOrigins = nil
+				break
+			} else if i := strings.IndexByte(origin, '*'); i >= 0 {
+				// Split the origin in two: start and end string without the *
+				w := wildcard{origin[0:i], origin[i+1 : len(origin)]}
+				c.allowedWOrigins = append(c.allowedWOrigins, w)
+			} else {
+				c.allowedOrigins = append(c.allowedOrigins, origin)
+			}
+		}
+	}
+
+	// Allowed Headers
+	if len(options.AllowedHeaders) == 0 {
+		// Use sensible defaults
+		c.allowedHeaders = []string{"Origin", "Accept", "Content-Type"}
+	} else {
+		// Origin is always appended as some browsers will always request for this header at preflight
+		c.allowedHeaders = convert(append(options.AllowedHeaders, "Origin"), http.CanonicalHeaderKey)
+		for _, h := range options.AllowedHeaders {
+			if h == "*" {
+				c.allowedHeadersAll = true
+				c.allowedHeaders = nil
+				break
+			}
+		}
+	}
+
+	// Allowed Methods
+	if len(options.AllowedMethods) == 0 {
+		// Default is spec's "simple" methods
+		c.allowedMethods = []string{"GET", "POST"}
+	} else {
+		c.allowedMethods = convert(options.AllowedMethods, strings.ToUpper)
+	}
+
+	return c
+}
+
+// Default creates a new Cors handler with default options
+func Default() *Cors {
+	return New(Options{})
+}
+
+// Handler apply the CORS specification on the request, and add relevant CORS headers
+// as necessary.
+func (c *Cors) Handler(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method == "OPTIONS" {
+			c.logf("Handler: Preflight request")
+			c.handlePreflight(w, r)
+			// Preflight requests are standalone and should stop the chain as some other
+			// middleware may not handle OPTIONS requests correctly. One typical example
+			// is authentication middleware ; OPTIONS requests won't carry authentication
+			// headers (see #1)
+			if c.optionPassthrough {
+				next.ServeHTTP(w, r)
+			}
+		} else {
+			c.logf("Handler: Actual request")
+			c.handleActualRequest(w, r)
+			next.ServeHTTP(w, r)
+		}
+	})
+}
+
+// handlePreflight handles pre-flight CORS requests
+func (c *Cors) handlePreflight(w http.ResponseWriter, r *http.Request) {
+	headers := w.Header()
+	origin := r.Header.Get("Origin")
+
+	if r.Method != "OPTIONS" {
+		c.logf("Preflight aborted: %s!=OPTIONS", r.Method)
+		return
+	}
+	// Always set Vary headers
+	// see https://github.com/rs/cors/issues/10,
+	//     https://github.com/rs/cors/commit/dbdca4d95feaa7511a46e6f1efb3b3aa505bc43f#commitcomment-12352001
+	headers.Add("Vary", "Origin")
+	headers.Add("Vary", "Access-Control-Request-Method")
+	headers.Add("Vary", "Access-Control-Request-Headers")
+
+	if origin == "" {
+		c.logf("Preflight aborted: empty origin")
+		return
+	}
+	if !c.isOriginAllowed(r, origin) {
+		c.logf("Preflight aborted: origin '%s' not allowed", origin)
+		return
+	}
+
+	reqMethod := r.Header.Get("Access-Control-Request-Method")
+	if !c.isMethodAllowed(reqMethod) {
+		c.logf("Preflight aborted: method '%s' not allowed", reqMethod)
+		return
+	}
+	reqHeaders := parseHeaderList(r.Header.Get("Access-Control-Request-Headers"))
+	if !c.areHeadersAllowed(reqHeaders) {
+		c.logf("Preflight aborted: headers '%v' not allowed", reqHeaders)
+		return
+	}
+	headers.Set("Access-Control-Allow-Origin", origin)
+	// Spec says: Since the list of methods can be unbounded, simply returning the method indicated
+	// by Access-Control-Request-Method (if supported) can be enough
+	headers.Set("Access-Control-Allow-Methods", strings.ToUpper(reqMethod))
+	if len(reqHeaders) > 0 {
+
+		// Spec says: Since the list of headers can be unbounded, simply returning supported headers
+		// from Access-Control-Request-Headers can be enough
+		headers.Set("Access-Control-Allow-Headers", strings.Join(reqHeaders, ", "))
+	}
+	if c.allowCredentials {
+		headers.Set("Access-Control-Allow-Credentials", "true")
+	}
+	if c.maxAge > 0 {
+		headers.Set("Access-Control-Max-Age", strconv.Itoa(c.maxAge))
+	}
+	c.logf("Preflight response headers: %v", headers)
+}
+
+// handleActualRequest handles simple cross-origin requests, actual request or redirects
+func (c *Cors) handleActualRequest(w http.ResponseWriter, r *http.Request) {
+	headers := w.Header()
+	origin := r.Header.Get("Origin")
+
+	if r.Method == "OPTIONS" {
+		c.logf("Actual request no headers added: method == %s", r.Method)
+		return
+	}
+	// Always set Vary, see https://github.com/rs/cors/issues/10
+	headers.Add("Vary", "Origin")
+	if origin == "" {
+		c.logf("Actual request no headers added: missing origin")
+		return
+	}
+	if !c.isOriginAllowed(r, origin) {
+		c.logf("Actual request no headers added: origin '%s' not allowed", origin)
+		return
+	}
+
+	// Note that spec does define a way to specifically disallow a simple method like GET or
+	// POST. Access-Control-Allow-Methods is only used for pre-flight requests and the
+	// spec doesn't instruct to check the allowed methods for simple cross-origin requests.
+	// We think it's a nice feature to be able to have control on those methods though.
+	if !c.isMethodAllowed(r.Method) {
+		if c.log != nil {
+			c.logf("Actual request no headers added: method '%s' not allowed",
+				r.Method)
+		}
+
+		return
+	}
+	headers.Set("Access-Control-Allow-Origin", origin)
+	if len(c.exposedHeaders) > 0 {
+		headers.Set("Access-Control-Expose-Headers", strings.Join(c.exposedHeaders, ", "))
+	}
+	if c.allowCredentials {
+		headers.Set("Access-Control-Allow-Credentials", "true")
+	}
+	c.logf("Actual response added headers: %v", headers)
+}
+
+// convenience method. checks if debugging is turned on before printing
+func (c *Cors) logf(format string, a ...interface{}) {
+	if c.log != nil {
+		c.log.Printf(format, a...)
+	}
+}
+
+// isOriginAllowed checks if a given origin is allowed to perform cross-domain requests
+// on the endpoint
+func (c *Cors) isOriginAllowed(r *http.Request, origin string) bool {
+	if c.allowOriginFunc != nil {
+		return c.allowOriginFunc(r, origin)
+	}
+	if c.allowedOriginsAll {
+		return true
+	}
+	origin = strings.ToLower(origin)
+	for _, o := range c.allowedOrigins {
+		if o == origin {
+			return true
+		}
+	}
+	for _, w := range c.allowedWOrigins {
+		if w.match(origin) {
+			return true
+		}
+	}
+	return false
+}
+
+// isMethodAllowed checks if a given method can be used as part of a cross-domain request
+// on the endpoing
+func (c *Cors) isMethodAllowed(method string) bool {
+	if len(c.allowedMethods) == 0 {
+		// If no method allowed, always return false, even for preflight request
+		return false
+	}
+	method = strings.ToUpper(method)
+	if method == "OPTIONS" {
+		// Always allow preflight requests
+		return true
+	}
+	for _, m := range c.allowedMethods {
+		if m == method {
+			return true
+		}
+	}
+	return false
+}
+
+// areHeadersAllowed checks if a given list of headers are allowed to used within
+// a cross-domain request.
+func (c *Cors) areHeadersAllowed(requestedHeaders []string) bool {
+	if c.allowedHeadersAll || len(requestedHeaders) == 0 {
+		return true
+	}
+	for _, header := range requestedHeaders {
+		header = http.CanonicalHeaderKey(header)
+		found := false
+		for _, h := range c.allowedHeaders {
+			if h == header {
+				found = true
+			}
+		}
+		if !found {
+			return false
+		}
+	}
+	return true
+}

vendor/github.com/go-chi/cors/utils.go

@@ -0,0 +1,70 @@
+package cors
+
+import "strings"
+
+const toLower = 'a' - 'A'
+
+type converter func(string) string
+
+type wildcard struct {
+	prefix string
+	suffix string
+}
+
+func (w wildcard) match(s string) bool {
+	return len(s) >= len(w.prefix+w.suffix) && strings.HasPrefix(s, w.prefix) && strings.HasSuffix(s, w.suffix)
+}
+
+// convert converts a list of string using the passed converter function
+func convert(s []string, c converter) []string {
+	out := []string{}
+	for _, i := range s {
+		out = append(out, c(i))
+	}
+	return out
+}
+
+// parseHeaderList tokenize + normalize a string containing a list of headers
+func parseHeaderList(headerList string) []string {
+	l := len(headerList)
+	h := make([]byte, 0, l)
+	upper := true
+	// Estimate the number headers in order to allocate the right splice size
+	t := 0
+	for i := 0; i < l; i++ {
+		if headerList[i] == ',' {
+			t++
+		}
+	}
+	headers := make([]string, 0, t)
+	for i := 0; i < l; i++ {
+		b := headerList[i]
+		if b >= 'a' && b <= 'z' {
+			if upper {
+				h = append(h, b-toLower)
+			} else {
+				h = append(h, b)
+			}
+		} else if b >= 'A' && b <= 'Z' {
+			if !upper {
+				h = append(h, b+toLower)
+			} else {
+				h = append(h, b)
+			}
+		} else if b == '-' || (b >= '0' && b <= '9') {
+			h = append(h, b)
+		}
+
+		if b == ' ' || b == ',' || i == l-1 {
+			if len(h) > 0 {
+				// Flush the found header
+				headers = append(headers, string(h))
+				h = h[:0]
+				upper = true
+			}
+		} else {
+			upper = b == '-'
+		}
+	}
+	return headers
+}