feat(pkg/publicip/info): add ip2location.io provider

Author: qdm12

pkg/publicip/info/ip2location.go

@@ -0,0 +1,78 @@
+package info
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/netip"
+)
+
+func newIP2Location(client *http.Client) *ip2Location {
+	return &ip2Location{
+		client: client,
+	}
+}
+
+type ip2Location struct {
+	client *http.Client
+}
+
+func (p *ip2Location) get(ctx context.Context, ip netip.Addr) (
+	result Result, err error) {
+	result.Source = string(Ipinfo)
+
+	url := "https://api.ip2location.io/"
+	if ip.IsValid() {
+		url += "?ip=" + ip.String()
+	}
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return result, fmt.Errorf("creating request: %w", err)
+	}
+
+	response, err := p.client.Do(request)
+	if err != nil {
+		return result, fmt.Errorf("doing request: %w", err)
+	}
+
+	switch response.StatusCode {
+	case http.StatusOK:
+	case http.StatusForbidden, http.StatusTooManyRequests:
+		bodyString := bodyToSingleLine(response.Body)
+		_ = response.Body.Close()
+		return result, fmt.Errorf("%w (%s)", ErrTooManyRequests, bodyString)
+	default:
+		bodyString := bodyToSingleLine(response.Body)
+		_ = response.Body.Close()
+		return result, fmt.Errorf("%w: %d %s (%s)", ErrBadHTTPStatus,
+			response.StatusCode, response.Status, bodyString)
+	}
+
+	decoder := json.NewDecoder(response.Body)
+	var data struct {
+		IP          netip.Addr `json:"ip"`
+		RegionName  string     `json:"region_name"`
+		CountryName string     `json:"country_name"`
+		CityName    string     `json:"city_name"`
+		// More fields available see https://www.ip2location.io/ip2location-documentation
+	}
+	err = decoder.Decode(&data)
+	if err != nil {
+		return result, fmt.Errorf("decoding JSON response: %w", err)
+	}
+
+	result.IP = data.IP
+	if data.RegionName != "" {
+		result.Region = stringPtr(data.RegionName)
+	}
+	if data.CityName != "" {
+		result.City = stringPtr(data.CityName)
+	}
+	if data.CountryName != "" {
+		country := countryCodeToName(data.CountryName)
+		result.Country = stringPtr(country)
+	}
+
+	return result, nil
+}

pkg/publicip/info/provider.go

@@ -11,12 +11,14 @@ import (
 type Provider string
 
 const (
-	Ipinfo Provider = "ipinfo"
+	Ipinfo      Provider = "ipinfo"
+	IP2Location Provider = "ip2location"
 )
 
 func ListProviders() []Provider {
 	return []Provider{
 		Ipinfo,
+		IP2Location,
 	}
 }
 
@@ -39,6 +41,8 @@ func newProvider(providerName Provider, client *http.Client) provider { //nolint
 	switch providerName {
 	case Ipinfo:
 		return newIpinfo(client)
+	case IP2Location:
+		return newIP2Location(client)
 	default:
 		panic(fmt.Sprintf("provider %s not implemented", providerName))
 	}