1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148

use std::fmt;

use url::Url;
use reqwest::{Client, StatusCode, header::ContentType};
use serde_urlencoded;

use crate::{
    response::ApiResponse,
    request::{
        ApiRequest,
        LangsRequest,
        DetectRequest,
        TranslateRequest
    },
    error::{
        Error,
        Result
    },
};


const BASE_URL: &str = "https://translate.yandex.net/api/v1.5/tr.json";



/// Client to call API methods.
pub struct ApiClient {
    key: String,
    client: Client,
}

impl ApiClient {
    /// Create new `ApiClient` with the specified API key.
    ///
    /// # Panic
    /// Panics if native TLS backend cannot be created or initialized.
    pub fn new(key: String) -> ApiClient {
        let client = Client::new();
        ApiClient {
            key,
            client,
        }
    }


    /// Create `LangsRequest` to call `getLangs` API method.
    pub fn get_langs(&self) -> LangsRequest {
        LangsRequest::new(&self)
    }


    /// Create `DetectRequest` to call `detect` API method.
    pub fn detect<'a>(&'a self, text: &'a str) -> DetectRequest<'a> {
        DetectRequest::new(&self, text)
    }


    /// Create `TranslateRequest` to call `translate` API method.
    pub fn translate<'a>(
        &'a self,
        text: &'a str,
        lang: &'a str
    ) -> TranslateRequest<'a> {
        
        TranslateRequest::new(&self, text, lang)
    }


    /// Execute prepared request.
    ///
    /// **Note**: this crate's [`ApiRequest`] structs have `get()` method, so that you don't need to call
    /// `execute` manually. But you can still use it to execute custom request structs that implement
    /// [`ApiRequest`].
    ///
    /// # Panic
    /// Panics if `req` cannot be serialized with `serde_urlencoded`.
    ///
    /// [`ApiRequest`]: trait.ApiRequest.html
    pub fn execute<Req, Resp>(&self, req: Req) -> Result<Resp>
        where Req: ApiRequest,
              Resp: ApiResponse,
    {
        let url = self.make_url(req.method());
        let data = serde_urlencoded::to_string(&req)
            .expect("can't serialize request contents");
        let resp = self.client
            .post(url)
            .body(data)
            .header(ContentType::form_url_encoded())
            .send();

        if let Ok(mut resp) = resp {
            if let StatusCode::Ok = resp.status() {
                if let Ok(obj) = resp.json() {
                    Ok(obj)
                } else {
                    Err(Error::UnexpectedResponse)
                }
            } else {
                if let Ok(err_obj) = resp.json() {
                    Err(Error::ApiError(err_obj))
                } else {
                    Err(Error::UnexpectedResponse)
                }
            }
        } else {
            Err(Error::RequestFailed)
        }
    }


    fn make_url(&self, method: &str) -> Url {
        let mut url = Url::parse(BASE_URL)
            .unwrap();             // always parsed
        url.path_segments_mut()
            .unwrap()              // BASE_URL is not cannot-be-a-base
            .push(method);
        url.query_pairs_mut()
            .append_pair("key", &self.key);
        url
    }
}


impl fmt::Debug for ApiClient {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("ApiClient")
            .finish()
    }
}




#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn make_url_test() {
        let api = ApiClient::new("mytoken".to_string());
        let url = api.make_url("method");
        assert_eq!(
            "https://translate.yandex.net/api/v1.5/tr.json/method?key=mytoken",
            url.as_str()
        );
    }
}