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

use crate::quote_vendor::QuoteVendor;
use anyhow::{anyhow, Context, Result};
use chrono::{DateTime, Utc};
use serde::{de::DeserializeOwned, Deserialize, Serialize};

#[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
pub struct Quote {
    pub quote: String,
    pub author: String,
    pub url: Option<String>,
    pub vendor: String,
    pub fetch_time: DateTime<Utc>,
}

impl Quote {
    pub fn fetch(vendor_key: &str, vendor: &QuoteVendor) -> Result<Self> {
        let res = reqwest::blocking::get(&vendor.endpoint)
            .context("Failed to fetch quote")?
            .text()?;
        Self::from_json(vendor_key, vendor, &res, chrono::Utc::now())
    }

    pub fn from_json(
        vendor_key: &str,
        vendor: &QuoteVendor,
        json_str: &str,
        fetch_time: DateTime<Utc>,
    ) -> Result<Self> {
        Ok(Self {
            quote: query_json(&vendor.queries.quote, json_str).context("Failed to parse quote")?,
            author: query_json(&vendor.queries.author, json_str)
                .context("Failed to parse author")?,
            url: if let Some(q) = &vendor.queries.url {
                query_json(&q, json_str).context("Failed to parse URL")?
            } else {
                None
            },
            vendor: vendor_key.to_owned(),
            fetch_time,
        })
    }
}

/// Query and deserialize value from JSON string.
fn query_json<T>(query: &str, json_str: &str) -> Result<T>
where
    T: DeserializeOwned,
{
    let val = ajson::get(json_str, query).ok_or(anyhow!("Failed to query value"))?;
    let val_str = if val.is_string() {
        // `ajson::Value::as_str` returns the contained string directly, so it is necessary to wrap
        // it in quotes to make it parseable by serde_json.
        format!("\"{}\"", val.as_str())
    } else {
        val.as_str().to_owned()
    };
    Ok(serde_json::from_str(&val_str)?)
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::quote_vendor::{QuoteQueries, QuoteVendor};

    fn make_vendor(queries: QuoteQueries) -> QuoteVendor {
        QuoteVendor {
            name: "Test".to_owned(),
            homepage: None,
            endpoint: "https://test".to_owned(),
            queries,
        }
    }

    #[test]
    fn query_json_str() {
        assert_eq!(
            query_json::<String>("s", r#"{ "s": "test" }"#).unwrap(),
            "test"
        );
    }

    #[test]
    fn from_json() {
        let vendor = make_vendor(QuoteQueries {
            quote: "quote".to_owned(),
            author: "author".to_owned(),
            url: None,
        });
        let fetch_time = chrono::Utc::now();
        assert_eq!(
            Quote::from_json(
                "test",
                &vendor,
                r#"{
                  "quote": "Test quote.",
                  "author": "Test Author",
                }"#,
                fetch_time,
            )
            .unwrap(),
            Quote {
                quote: "Test quote.".to_owned(),
                author: "Test Author".to_owned(),
                url: None,
                vendor: "test".to_owned(),
                fetch_time
            }
        )
    }

    #[test]
    fn from_json_url() {
        let vendor = make_vendor(QuoteQueries {
            quote: "quote".to_owned(),
            author: "author".to_owned(),
            url: Some("url".to_owned()),
        });
        let fetch_time = chrono::Utc::now();
        assert_eq!(
            Quote::from_json(
                "test",
                &vendor,
                r#"{
                  "quote": "Test quote.",
                  "author": "Test Author",
                  "url": "https://test/quote",
                }"#,
                fetch_time,
            )
            .unwrap(),
            Quote {
                quote: "Test quote.".to_owned(),
                author: "Test Author".to_owned(),
                url: Some("https://test/quote".to_owned()),
                vendor: "test".to_owned(),
                fetch_time
            }
        )
    }
}