.rs

#[derive(Deserialize, Debug)]
pub struct Submission {
    #[serde(rename = "id")]
    pub thing_id: String,
    pub author: String,
    pub title: String,
    pub created_utc: f32,
    pub score: i32,
    pub url: String,
}

// Payload:
//
// [ { data: { children: [ { data: Submission } ] } }
// , {}
// ]
//
// Path: [0] -> .data -> .children -> [0] -> .data
pub fn fetch_submission(client: &Client, thing_id: &str) -> Result<Option<Submission>, Error> {
    let url: Url = format!("https://www.reddit.com/{}.json", thing_id).parse().unwrap();
    let mut response = client.get(url).send()?;
    assert!(response.status().is_success());
    let body = response.json::<serde_json::Value>()?;

    let submission: Option<Submission> = match body {
        Value::Array(arr) => {
            match arr.get(0) {
                Some(Value::Object(map)) => {
                    match map.get("data") {
                        Some(Value::Object(map)) => {
                            match map.get("children") {
                                Some(Value::Array(arr)) => {
                                    match arr.get(0) {
                                        Some(Value::Object(map)) => {
                                            match map.get("data") {
                                                Some(Value::Object(map)) => {
                                                    serde_json::from_value(Value::Object(map.clone()))?
                                                },
                                                _ => None
                                            }
                                        },
                                        _ => None
                                    }
                                },
                                _ => None
                            }
                        },
                        _ => None
                    }
                },
                _ => None
            }
        },
        _ => None
    };

    Ok(submission)
}

let submission: Option<Submission> = serde_json::from_value(body
    .get(0)?
    .get("data")?
    .get("children")?
    .get(0)?
    .get("data")?
    .take()
)?;