45 lines
873 B
Go
45 lines
873 B
Go
package dyndns
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import (
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"errors"
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"io/ioutil"
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"net/http"
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)
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// Urls contains a set of mirrors in which a
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// raw IP string can be retreived. It is exported
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// for the intent of modification.
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var (
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Urls = []string{"https://ip.darkcloud.ca"}
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)
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func tryMirror(url string) (string, error) {
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resp, err := http.Get(url)
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if err != nil {
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return "", err
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}
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defer resp.Body.Close()
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contents, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return "", err
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}
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return string(contents), nil
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}
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// GetExternalIP retrieves the external facing IP Address.
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// If multiple mirrors are provided in Urls,
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// it will try each one (in order), should
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// preceding mirrors fail.
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func GetExternalIP() (string, error) {
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for _, url := range Urls {
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resp, err := tryMirror(url)
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if err == nil {
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return resp, err
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}
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}
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return "", errors.New("Could not retreive external IP")
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}
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