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diff --git a/plugin/geoip/README.md b/plugin/geoip/README.md new file mode 100644 index 000000000..b666518f7 --- /dev/null +++ b/plugin/geoip/README.md @@ -0,0 +1,73 @@ +# geoip + +## Name +*geoip* - Lookup maxmind geoip2 databases using the client IP, then add associated geoip data to the context request. + +## Description +The *geoip* plugin add geo location data associated with the client IP, it allows you to configure a [geoIP2 maxmind database](https://dev.maxmind.com/geoip/docs/databases) to add the geo location data associated with the IP address. + +The data is added leveraging the *metadata* plugin, values can then be retrieved using it as well, for example: + +```go +import ( + "strconv" + "github.com/coredns/coredns/plugin/metadata" +) +// ... +if getLongitude := metadata.ValueFunc(ctx, "geoip/longitude"); getLongitude != nil { + if longitude, err := strconv.ParseFloat(getLongitude(), 64); err == nil { + // Do something useful with longitude. + } +} else { + // The metadata label geoip/longitude for some reason, was not set. +} +// ... +``` + +## Databases +The supported databases use city schema such as `City` and `Enterprise`. Other databases types with different schemas are not supported yet. + +You can download a [free and public City database](https://dev.maxmind.com/geoip/geolite2-free-geolocation-data). + +## Syntax +```txt +geoip [DBFILE] +``` +* **DBFILE** the mmdb database file path. + +## Examples +The following configuration configures the `City` database. +```txt +. { + geoip /opt/geoip2/db/GeoLite2-City.mmdb + metadata # Note that metadata plugin must be enabled as well. +} +``` + +## Metadatada Labels +A limited set of fields will be exported as labels, all values are stored using strings **regardless of their underlying value type**, and therefore you may have to convert it back to its original type, note that numeric values are always represented in base 10. + +| Label | Type | Example | Description +| :----------------------------------- | :-------- | :-------------- | :------------------ +| `geoip/city/name` | `string` | `Cambridge` | Then city name in English language. +| `geoip/country/code` | `string` | `GB` | Country [ISO 3166-1](https://en.wikipedia.org/wiki/ISO_3166-1) code. +| `geoip/country/name` | `string` | `United Kingdom` | The country name in English language. +| `geoip/country/is_in_european_union` | `bool` | `false` | Either `true` or `false`. +| `geoip/continent/code` | `string` | `EU` | See [Continent codes](#ContinentCodes). +| `geoip/continent/name` | `string` | `Europe` | The continent name in English language. +| `geoip/latitude` | `float64` | `52.2242` | Base 10, max available precision. +| `geoip/longitude` | `float64` | `0.1315` | Base 10, max available precision. +| `geoip/timezone` | `string` | `Europe/London` | The timezone. +| `geoip/postalcode` | `string` | `CB4` | The postal code. + +## Continent Codes + +| Value | Continent (EN) | +| :---- | :------------- | +| AF | Africa | +| AN | Antarctica | +| AS | Asia | +| EU | Europe | +| NA | North America | +| OC | Oceania | +| SA | South America | |