Melora Hugues
568aaa9f8c
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Ref #3 This commit uses a GET query to ifconfig.me in order to get the current public IP. It also modifies the initialization message to send the current public IP to the Telegram channel instead of a simple message.
52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
package ip
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import (
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"bytes"
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"context"
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"fmt"
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"io"
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"net"
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"net/http"
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)
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const ifconfigURL = "https://ifconfig.me"
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const httpMaxRead = 100
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// TODO: use a struct, but a baseHTTPClient inside it to perform unit tests
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type Getter interface {
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GetCurrentPublicIP(ctx context.Context) (net.IP, error)
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}
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type concreteIPGetter struct {
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}
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func (c *concreteIPGetter) GetCurrentPublicIP(ctx context.Context) (net.IP, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, ifconfigURL, nil)
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if err != nil {
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return nil, fmt.Errorf("failed to prepare public IP request: %w", err)
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}
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("failed to get current IP from ifconfig: %w", err)
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}
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if resp.ContentLength > httpMaxRead {
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return nil, fmt.Errorf("response too big: %d/%d", resp.ContentLength, httpMaxRead)
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}
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buf := bytes.NewBuffer([]byte{})
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if _, err := io.CopyN(buf, resp.Body, resp.ContentLength); err != nil {
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return nil, fmt.Errorf("error parsing body: %w", err)
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}
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content := string(buf.Bytes())
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res := net.ParseIP(content)
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if res == nil {
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return nil, fmt.Errorf("got an invalid public IP %q", content)
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}
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return res, nil
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}
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func New() *concreteIPGetter {
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return &concreteIPGetter{}
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}
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