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An unofficial Google Maps Platform client library for the Rust programming language.

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# google_maps
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An unofficial Google Maps Platform client library for the Rust programming language.

This client currently implements the Directions API, Distance Matrix API, Elevation API, Geocoding API, Time Zone API, and parts of the Places and Roads API.

# Installation

Configure the dependencies in your project's `Cargo.toml` file:

```toml
[dependencies]
google_maps = "3.9"
```

Optionally, add `rust_decimal = "1"` and `rust_decimal_macros = "1"` for access to the `dec!` macro. This macro can be used to define decimal numbers in your program.

This is useful for hard-coding latitudes and longitudes into your code for testing.

## Feature Flags

The desired Google Maps APIs can be enabled individually via feature flags.

Additionally, usage of rustls for Reqwest is supported.

### Google Maps Client Feature Flags:

* `address_validation` ‧ includes Google Maps Address Validation API
* `directions` ‧ includes Google Maps Directions API
* `distance_matrix` ‧ includes Google Maps Distance Matrix API
* `elevation` ‧ includes Google Maps Elevation API
* `geocoding` ‧ includes Google Maps Geocoding API
* `roads` ‧ includes Google Maps Roads API
* `time_zone` ‧ includes Google Maps Time Zone API
* `reqwest` ‧ uses [reqwest](https://crates.io/crates/reqwest) for
  querying the Google Maps API
* `reqwest-middleware` ‧ uses [reqwest-middleware](https://crates.io/crates/reqwest-middleware)
  for querying the Google Maps API
* `geo` ‧ support for the rust [geo](https://crates.io/crates/geo) ecosystem
* `polyline` ‧ allows easy type conversions from a `Route` or `Step` to a geo
  [LineString](https://docs.rs/geo-types/0.7.13/geo_types/geometry/struct.LineString.html)

#### Google Maps Places API (New) Features

* `places-new` ‧ includes all Google Maps Places API (New) services
* `places-new-autocomplete` ‧ Autocomplete service only
* `places-new-nearby-search` ‧ Nearby Search service only
* `places-new-place-details` ‧ Place Details service only
* `places-new-place-photos` ‧ Place Photos service only
* `places-new-text-search` ‧ Text Search service only

#### Google Maps Places API (Legacy) Features

* `autocomplete` ‧ includes Google Maps Places API (Legacy) Autocomplete service
* `places` ‧ includes Google Maps Places API (Legacy)

Note: the `autocomplete` feature covers the Places API autocomplete-related services:
[Place Autocomplete requests](https://docs.rs/google_maps/latest/google_maps/prelude/struct.ClientSettings.html#method.place_autocomplete)
and [Query Autocomplete requests](https://docs.rs/google_maps/latest/google_maps/prelude/struct.ClientSettings.html#method.query_autocomplete).
All other Places API services are covered by the `places` feature.

### reqwest Feature Flags

For use with `reqwest` only.

* `reqwest-native-tls` ‧ Enables TLS functionality provided by `native-tls`.
* `reqwest-rustls-tls` ‧ Enables TLS functionality provided by `rustls`.

### Default Feature Flags

By default, the Google Maps client includes all implemented Google Maps APIs. Reqwest will secure
the connection using the system-native TLS (`native-tls`), and has gzip compression
enabled (`gzip`).

```toml
default = [
	# google_maps default features:
	"address_validation",
	"directions",
	"distance_matrix",
	"elevation",
	"geocoding",
	"time_zone",
	"roads",
	"places-new",

# reqwest default features:
	"reqwest",
	"reqwest-default-tls",
	"reqwest-http2",
	"reqwest-brotli",

# rust_decimal default features:
	"decimal-serde",
]
```

#### Feature flag usage example

This example will only include the Google Maps Directions API. Reqwest will secure the connection
using the Rustls library, and has brotli compression enabled.

```toml
[dependencies.google_maps]
version = "3.9"
default-features = false
features = ["directions", "reqwest", "reqwest-rustls-tls", "reqwest-brotli"]
```

# Release Notes

The [full changelog is available here](https://github.com/leontoeides/google_maps/blob/master/CHANGELOG.md).

Releases [are available on GitHub](https://github.com/leontoeides/google_maps/releases).

# Examples

## Autocomplete

Autocomplete (New) is a web service that returns place predictions and query predictions in response
to an HTTP request. In the request, specify a text search string and geographic bounds that controls
the search area.

Autocomplete (New) can match on full words and substrings of the input, resolving place names,
addresses, and plus codes. Applications can therefore send queries as the user types, to provide
on-the-fly place and query predictions.

```rust
let google_maps_client = google_maps::Client::try_new("YOUR_API_KEY_HERE")?;

let response = google_maps_client
    .autocomplete("pizza")
    .included_primary_types(vec![google_maps::places_new::PlaceType::Restaurant])
    .execute()
    .await?;

for suggestion in &response {
    println!("{}", suggestion.text());
}

// User adds "sicilian" to pizza search:
let response = google_maps_client
    .next_autocomplete("pizza sicilian", response)
    .await?;

for suggestion in response {
    println!("{}", suggestion.to_html("mark"));
}
```

## Text Search

Text Search (New) returns information about a set of places based on a string (for example, "pizza
in New York" or "shoe stores near Ottawa" or "123 Main Street").

```rust
let google_maps_client = google_maps::Client::try_new("YOUR_API_KEY_HERE")?;

let response = google_maps_client
    .text_search("Gas in Edmonton, Alberta")
    .field_mask(google_maps::places_new::FieldMask::All)
    .execute()
    .await?;

for place in response {
    println!("{place:#?}");
}
```

## Nearby Search

A Nearby Search (New) request takes one or more place types, and returns a list of matching places
within the specified area.

```rust
let google_maps_client = google_maps::Client::try_new("YOUR_API_KEY_HERE")?;

// Restaurants within a 5,000 m radius of the Bowker Building in Edmonton
let response = google_maps_client
    .nearby_search((53.53666, -113.50795, 5_000.0))?
    .field_mask(google_maps::places_new::FieldMask::All)
    .included_primary_types(vec![google_maps::places_new::PlaceType::Restaurant])
    .execute()
    .await?;

for place in response {
    println!("{place:#?}");
}
```

## Place Details

Once you have a place ID, you can request more details about a particular establishment or point of
interest by initiating a Place Details (New) request.

A Place Details (New) request returns more comprehensive information about the indicated place such
as its complete address, phone number, user rating and reviews.

There are many ways to obtain a place ID. You can use:

* Text Search (New) or Nearby Search (New)
* Geocoding API
* Routes API
* Address Validation API
* Autocomplete (New)

You can also experiment using the [Place ID
Finder](https://developers.google.com/maps/documentation/javascript/examples/places-placeid-finder)

```rust
let google_maps_client = google_maps::Client::try_new("YOUR_API_KEY_HERE")?;

let place = google_maps_client
    .place_details("ChIJyZXV1jsioFMRC8PGIBAJbKA")?
    .field_mask(google_maps::places_new::FieldMask::All)
    .execute()
    .await?;

println!("{place:#?}");
```

## Place Photos

The Place Photos (New) service is a read-only API that lets you add high quality photographic
content to your application. Place Photos (New) gives you access to the millions of photos stored in
the Places database.

When you get place information using a Place Details (New), Nearby Search (New), or Text Search
(New) request, you can also request photo resources for relevant photographic content. Using Place
Photos (New), you can then access the referenced photos and resize the image to the optimal size for
your application.

```rust
for place in response.into_iter().take(3) {
    // Download and display photo as ASCII art.
    // `places-new-ascii-art` feature must be enabled
    if let Ok(photo) = google_maps_client
        .place_photos_image(&place)?
        .max_width_px(1_024)
        .execute()
        .await
    {
        println!("{}", photo.display_ansi(
            // 180 columns wide
            std::num::NonZero::new(180).unwrap()
        )?);
    }
}
```

## Address Validation

The Address Validation API validates an address and its components, standardizes
the address for mailing, and determines the best known geocode for it.

```rust
use google_maps::prelude::*;

let google_maps_client = google_maps::Client::try_new("YOUR_API_KEY_HERE")?;

let postal_address = PostalAddress::builder()
    .region_code(&Country::UnitedStates)
    .address_lines(vec![
        "1600 Amphitheatre Pkwy",
        "Mountain View, CA, 94043"
    ])
    .build();

let address_validation_response = google_maps_client
    .validate_address()
    .address(postal_address)
    .build()
    .execute()
    .await?;

// Dump entire response:
println!("{address_validation_response:#?}");

// Optional feedback step. Let Google know which address was used for the
// your query:

google_maps_client
    .provide_validation_feedback()
    .conclusion(ValidationConclusion::Unused)
    .response_id(address_validation_response.response_id())
    .build()
    .execute()
    .await?;
```

## Directions API

The Directions API is a service that calculates directions between locations.
You can search for directions for several modes of transportation, including
transit, driving, walking, or cycling.

```rust
use google_maps::prelude::*;

let google_maps_client = Client::new("YOUR_GOOGLE_API_KEY_HERE");

// Example request:

let directions = google_maps_client.directions(
    // Origin: Canadian Museum of Nature
    Location::from_address("240 McLeod St, Ottawa, ON K2P 2R1"),
    // Destination: Canada Science and Technology Museum
    Location::try_from_f32(45.403_509, -75.618_904)?,
)
.with_travel_mode(TravelMode::Driving)
.execute()
.await?;

// Dump entire response:

println!("{:#?}", directions);
```

## Distance Matrix API

The Distance Matrix API is a service that provides travel distance and time for
a matrix of origins and destinations, based on the recommended route between
start and end points.

```rust
use google_maps::prelude::*;

let google_maps_client = Client::new("YOUR_GOOGLE_API_KEY_HERE");

// Example request:

let distance_matrix = google_maps_client.distance_matrix(
    // Origins
    vec![
        // Microsoft
        Waypoint::from_address("One Microsoft Way, Redmond, WA 98052, United States"),
        // Cloudflare
        Waypoint::from_address("101 Townsend St, San Francisco, CA 94107, United States"),
    ],
    // Destinations
    vec![
        // Google
        Waypoint::from_place_id("ChIJj61dQgK6j4AR4GeTYWZsKWw"),
        // Mozilla
        Waypoint::try_from_f32(37.387_316, -122.060_008)?,
    ],
).execute().await?;

// Dump entire response:

println!("{:#?}", distance_matrix);
```

## Elevation API (Positional)

The Elevation API provides elevation data for all locations on the surface of
the earth, including depth locations on the ocean floor (which return negative
values).

```rust
use google_maps::prelude::*;

let google_maps_client = Client::new("YOUR_GOOGLE_API_KEY_HERE");

// Example request:

let elevation = google_maps_client.elevation()
    // Denver, Colorado, the "Mile High City"
    .for_positional_request(LatLng::try_from_dec(dec!(39.739_154), dec!(-104.984_703))?)
    .execute()
    .await?;

// Dump entire response:

println!("{:#?}", elevation);

// Display all results:

if let Some(results) = &elevation.results {
    for result in results {
        println!("Elevation: {} meters", result.elevation)
    }
}
```

## Geocoding API

The Geocoding API is a service that provides geocoding and reverse geocoding of
addresses. Geocoding is the process of converting addresses (like a street
address) into geographic coordinates (like latitude and longitude), which you
can use to place markers on a map, or position the map.

```rust
use google_maps::prelude::*;

let google_maps_client = Client::new("YOUR_GOOGLE_API_KEY_HERE");

// Example request:

let location = google_maps_client.geocoding()
    .with_address("10 Downing Street London")
    .execute()
    .await?;

// Dump entire response:

println!("{:#?}", location);

// Print latitude & longitude coordinates:

for result in location.results {
    println!("{}", result.geometry.location)
}
```

## Reverse Geocoding API

The Geocoding API is a service that provides geocoding and reverse geocoding of
addresses. Reverse geocoding is the process of converting geographic coordinates
into a human-readable address.

```rust
use google_maps::prelude::*;

let google_maps_client = Client::new("YOUR_GOOGLE_API_KEY_HERE");

// Example request:

let location = google_maps_client.reverse_geocoding(
    // 10 Downing St, Westminster, London
    LatLng::try_from_dec(dec!(51.503_364), dec!(-0.127_625))?,
)
.with_result_type(PlaceType::StreetAddress)
.execute()
.await?;

// Dump entire response:

println!("{:#?}", location);

// Display all results:

for result in location.results {
    println!(
        "{}",
        result.address_components.iter()
            .map(|address_component| address_component.short_name.to_string())
            .collect::<Vec<String>>()
            .join(", ")
    );
}
```

## Time Zone API

The Time Zone API provides time offset data for locations on the surface of the
earth. You request the time zone information for a specific latitude/longitude
pair and date. The API returns the name of that time zone, the time offset from
UTC, and the daylight savings offset.

```rust
use google_maps::prelude::*;

let google_maps_client = Client::new("YOUR_GOOGLE_API_KEY_HERE");

// Example request:

let time_zone = google_maps_client.time_zone(
     // St. Vitus Cathedral in Prague, Czechia
     LatLng::try_from_dec(dec!(50.090_903), dec!(14.400_512))?,
     // The time right now in UTC (Coordinated Universal Time)
     Utc::now()
).execute().await?;

// Dump entire response:

println!("{:#?}", time_zone);

// Usage example:

println!("Time at your computer: {}", Local::now().to_rfc2822());

if let Some(time_zone_id) = time_zone.time_zone_id {
    println!(
    	"Time in {}: {}",
        time_zone_id.name(),
        Utc::now().with_timezone(&time_zone_id).to_rfc2822()
    );
}
```

### Controlling Request Settings

The Google Maps client settings can be used to change the request rate and
automatic retry parameters.

```rust
use google_maps::prelude::*;

let google_maps_client = Client::new("YOUR_GOOGLE_API_KEY_HERE")
    // For all Google Maps Platform APIs, the client will limit 2 sucessful
    // requests for every 10 seconds:
    .with_rate(Api::All, 2, std::time::Duration::from_secs(10))
    // Returns the `Client` struct to the caller. This struct is used
    // to make Google Maps Platform requests.
    .build();
```

# Crate Status

This crate is maintained but frequent updates are not expected. This crate
currently implements all of the Google Maps features that most users would need.
Most updates will be for occasional dependency bumps.

# Feedback

I would like for you to be successful with your project! If this crate is not
working for you, doesn't work how you think it should, or if you have requests,
or suggestions - please [report them to
me](https://github.com/leontoeides/google_maps/issues)! I'm not always fast at
responding but I will respond. Thanks!

# Roadmap

- [ ] Track both _requests_ and request _elements_ for rate limiting.
- [ ] Convert explicit query validation to session types wherever reasonable.
- [ ] [Places API](https://developers.google.com/places/web-service/intro). Only
partly implemented. If you would like to have any missing pieces implemented,
please contact me.
- [ ] [Roads API](https://developers.google.com/maps/documentation/roads/intro).
Only partly implemented. If you would like to have any missing pieces
implemented, please contact me.

# Author's Note

This crate is expected to work well and have the more important Google Maps
features implemented. It should work well because
[serde](https://crates.io/crates/serde), [serde-json](https://crates.io/crates/serde-json)
and, by default, [reqwest](https://crates.io/crates/reqwest) do most of the
heavy lifting!

I created this client library because I needed several Google Maps Platform
features for a project that I'm working on. So, I've decided to spin my library
off into a public crate. This is a very small token of gratitude and an attempt
to give back to the Rust community. I hope it saves someone out there some work.

google_maps

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