stubr 0.6.2

Wiremock implemented in Rust
Documentation 
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use handlebars::{Context, Handlebars, Helper, HelperDef, PathAndJson, RenderContext, RenderError, ScopedJson};
use percent_encoding::{percent_decode_str, utf8_percent_encode, NON_ALPHANUMERIC};
use serde_json::Value;

use super::ValueExt;

pub struct UrlEncodingHelper;

impl UrlEncodingHelper {
    pub const NAME: &'static str = "urlEncode";
    pub const DECODE: &'static str = "decode";

    fn value<'a>(h: &'a Helper) -> Option<&'a str> {
        h.params()
            .get(0)
            .and_then(|p| p.value().as_str().or_else(|| p.relative_path().map(String::as_str)))
            .map(str::escape_single_quotes)
    }

    fn url_encode(raw: &str) -> Option<String> {
        Some(utf8_percent_encode(raw, NON_ALPHANUMERIC).to_string())
    }

    fn url_decode(raw: &str) -> Option<String> {
        percent_decode_str(raw).decode_utf8().map(|d| d.to_string()).ok()
    }

    fn is_decode(h: &Helper) -> bool {
        h.hash_get(Self::DECODE)
            .map(PathAndJson::value)
            .and_then(Value::as_bool)
            .unwrap_or_default()
    }
}

impl HelperDef for UrlEncodingHelper {
    fn call_inner<'reg: 'rc, 'rc>(
        &self, h: &Helper<'reg, 'rc>, _: &'reg Handlebars<'reg>, _: &'rc Context, _: &mut RenderContext<'reg, 'rc>,
    ) -> Result<ScopedJson<'reg, 'rc>, RenderError> {
        Self::value(h)
            .and_then(|v| {
                if Self::is_decode(h) {
                    Self::url_decode(v)
                } else {
                    Self::url_encode(v)
                }
            })
            .ok_or_else(|| RenderError::new("Invalid url (de)encoding response template"))
            .map(Value::from)
            .map(ScopedJson::from)
    }
}