gutenberg-rs 0.1.0

This crate is used to get information and data from gutenberg (https://www.gutenberg.org/)
Documentation 
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use crate::error::Error;
use serde_json::Value;
use std::path::Path;

pub struct GutenbergCacheSettings {
    pub cache_rdf_download_link: String,
    pub cache_filename: String,
    pub cache_rdf_unpack_directory: String,
    pub cache_rdf_archive_name: String,
    pub text_files_cache_folder: String,
    pub mongo_db_connection_server: String,
}

impl Default for GutenbergCacheSettings {
    fn default() -> GutenbergCacheSettings {
        GutenbergCacheSettings {
            text_files_cache_folder: "text_cache".to_string(),
            cache_rdf_download_link: "https://www.gutenberg.org/cache/epub/feeds/rdf-files.tar.bz2"
                .to_string(),
            cache_filename: "gutenbergindex.db".to_string(),
            cache_rdf_unpack_directory: Path::new("cache")
                .join("epub")
                .as_path()
                .display()
                .to_string(),
            cache_rdf_archive_name: "rdf-files.tar.bz2".to_string(),
            mongo_db_connection_server: "mongodb://localhost:27017".to_string(),
        }
    }
}

impl GutenbergCacheSettings {
    pub fn from(json: &Value) -> Result<GutenbergCacheSettings, Error> {
        let mut settings = GutenbergCacheSettings::default();
        if let Some(field) = json.get("CacheFilename") {
            if let Some(v) = field.as_str() {
                settings.cache_filename = v.to_string();
            } else {
                return Err(Error::InvalidSettingsField("CacheFilename".to_string()));
            }
        }
        if let Some(field) = json.get("CacheUnpackDir") {
            if let Some(v) = field.as_str() {
                settings.cache_rdf_unpack_directory = v.to_string();
            } else {
                return Err(Error::InvalidSettingsField("CacheUnpackDir".to_string()));
            }
        }
        if let Some(field) = json.get("CacheArchiveName") {
            if let Some(v) = field.as_str() {
                settings.cache_rdf_archive_name = v.to_string();
            } else {
                return Err(Error::InvalidSettingsField("CacheArchiveName".to_string()));
            }
        }
        if let Some(field) = json.get("CacheRDFDownloadLink") {
            if let Some(v) = field.as_str() {
                settings.cache_rdf_download_link = v.to_string();
            } else {
                return Err(Error::InvalidSettingsField(
                    "CacheRDFDownloadLink".to_string(),
                ));
            }
        }
        if let Some(field) = json.get("TextFilesCacheFolder") {
            if let Some(v) = field.as_str() {
                settings.text_files_cache_folder = v.to_string();
            } else {
                return Err(Error::InvalidSettingsField(
                    "TextFilesCacheFolder".to_string(),
                ));
            }
        }
        if let Some(field) = json.get("MongoDBCacheServer") {
            if let Some(v) = field.as_str() {
                settings.mongo_db_connection_server = v.to_string();
            } else {
                return Err(Error::InvalidSettingsField(
                    "MongoDBCacheServer".to_string(),
                ));
            }
        }
        Ok(settings)
    }
}