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|
use std::{
collections::HashMap,
sync::Arc
};
use serde::{
Serialize, Deserialize,
de::{
Deserializer,
},
};
use failure::Error;
use vec1::Vec1;
use mail_core::{Resource, Source, IRI};
use super::{
Template,
TemplateEngine,
CwdBaseDir,
PathRebaseable,
InnerTemplate,
Subject,
};
/// Type used when deserializing a template using serde.
///
/// This type should only be used as intermediate type
/// used for deserialization as templates need to be
/// bundled with a template engine.
///
/// # Serialize/Deserialize
///
/// The derserialization currently only works with
/// self-describing data formats.
///
/// There are a number of shortcuts to deserialize
/// resources (from emebddings and/or attachments):
///
/// - Resources can be deserialized normally (from a externally tagged enum)
/// - Resources can be deserialized from the serialized repr of `Source`
/// - Resources can be deserialized from a string which is used to create
/// a `Resource::Source` with a iri using the `path` scheme and the string
/// content as the iris "tail".
#[derive(Debug, Serialize, Deserialize)]
pub struct TemplateBase<TE: TemplateEngine> {
#[serde(rename="name")]
template_name: String,
base_dir: CwdBaseDir,
subject: LazySubject,
bodies: Vec1<TE::LazyBodyTemplate>,
//TODO impl. deserialize where
// resource:String -> IRI::new("path", resource) -> Resource::Source
#[serde(deserialize_with="deserialize_embeddings")]
embeddings: HashMap<String, Resource>,
#[serde(deserialize_with="deserialize_attachments")]
attachments: Vec<Resource>,
}
impl<TE> TemplateBase<TE>
where TE: TemplateEngine
{
//TODO!! make this load all embeddings/attachments and make it a future
/// Couples the template base with a specific engine instance.
pub fn load(self, mut engine: TE) -> Result<Template<TE>, Error> {
let TemplateBase {
template_name,
base_dir,
subject,
bodies,
mut embeddings,
mut attachments
} = self;
let subject = Subject{ template_id: engine.load_subject_template(subject.template_string)? };
let bodies = bodies.try_mapped(|mut lazy_body| -> Result<_, Error> {
lazy_body.rebase_to_include_base_dir(&base_dir)?;
Ok(engine.load_body_template(lazy_body)?)
})?;
for embedding in embeddings.values_mut() {
embedding.rebase_to_include_base_dir(&base_dir)?;
}
for attachment in attachments.iter_mut() {
attachment.rebase_to_include_base_dir(&base_dir)?;
}
let inner = InnerTemplate {
template_name,
base_dir,
subject,
bodies,
embeddings,
attachments,
engine
};
Ok(Template { inner: Arc::new(inner) })
}
}
#[derive(Debug, Serialize, Deserialize)]
struct LazySubject {
#[serde(flatten)]
template_string: String
}
#[derive(Deserialize)]
#[serde(untagged)]
enum ResourceDeserializationHelper {
// Note: VARIANT ORDER MATTERS (serde,untagged)
// This allows specifying resources in three ways.
// 1. as tagged enum `Resource` (e.g. `{"Source": { "iri": ...}}}`)
// 2. as struct `Source` (e.g. `{"iri": ...}` )
// 3. as String which is interpreted as path iri
Normal(Resource),
FromSource(Source),
FromString(String)
}
impl Into<Resource> for ResourceDeserializationHelper {
fn into(self) -> Resource {
use self::ResourceDeserializationHelper::*;
match self {
Normal(resource) => resource,
FromString(string) => {
let source = Source {
//UNWRAP_SAFE: only scheme validation could fail,
// but its static "path" which is known to be valid
iri: IRI::from_parts("path", &string).unwrap(),
use_media_type: Default::default(),
use_file_name: Default::default()
};
Resource::Source(source)
},
FromSource(source) => Resource::Source(source)
}
}
}
fn deserialize_embeddings<'de, D>(deserializer: D)
-> Result<HashMap<String, Resource>, D::Error>
where D: Deserializer<'de>
{
//FIXME[perf] write custom visitor etc.
let map = <HashMap<String, ResourceDeserializationHelper>>
::deserialize(deserializer)?;
let map = map.into_iter()
.map(|(k, helper)| (k, helper.into()))
.collect();
Ok(map)
}
fn deserialize_attachments<'de, D>(deserializer: D)
-> Result<Vec<Resource>, D::Error>
where D: Deserializer<'de>
{
//FIXME[perf] write custom visitor etc.
let vec = <Vec<ResourceDeserializationHelper>>
::deserialize(deserializer)?;
let vec = vec.into_iter()
.map(|helper| helper.into())
.collect();
Ok(vec)
}
|
