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// Copyright 2013 Canonical Ltd. This software is licensed under the
// GNU Lesser General Public License version 3 (see the file COPYING).
package gwacl
import (
"fmt"
"net/url"
"strings"
)
// APIEndpoint describes the base URL for accesing Windows Azure's APIs.
//
// Azure will have subdomains on this URL's domain, such as blob.<domain> for
// storage, with further sub-domains for storage accounts; management.<domain>
// for the management API; and possibly more such as queue.<domain>,
// table.<domain>. APIEndpoint defines methods to obtain these URLs.
type APIEndpoint string
// GetEndpoint returns the API endpoint for the given location. This is
// hard-coded, so some guesswork may be involved.
func GetEndpoint(location string) APIEndpoint {
if strings.Contains(location, "China") {
// Mainland China is a special case. It has its own endpoint.
return "https://core.chinacloudapi.cn/"
}
// The rest of the world shares a single endpoint.
return "https://core.windows.net/"
}
// prefixHost prefixes the hostname part of a URL with a subdomain. For
// example, prefixHost("foo", "http://example.com") becomes
// "http://foo.example.com".
//
// The URL must be well-formed, and contain a hostname.
func prefixHost(host, originalURL string) string {
parsedURL, err := url.Parse(originalURL)
if err != nil {
panic(fmt.Errorf("failed to parse URL %s - %v", originalURL, err))
}
if parsedURL.Host == "" {
panic(fmt.Errorf("no hostname in URL '%s'", originalURL))
}
// Escape manually. Strangely, turning a url.URL into a string does not
// do this for you.
parsedURL.Host = url.QueryEscape(host) + "." + parsedURL.Host
return parsedURL.String()
}
// ManagementAPI returns the URL for the endpoint's management API.
func (endpoint APIEndpoint) ManagementAPI() string {
return prefixHost("management", string(endpoint))
}
// BlobStorageAPI returns the base URL for the endpoint's blob storage API.
//
// Actual storage API requests are made to subdomains of this URL. To address
// a particular storage account, prefix it as a subdomain to the hostname
// portion of this URL.
func (endpoint APIEndpoint) BlobStorageAPI() string {
return prefixHost("blob", string(endpoint))
}
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