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use indexmap::IndexMap;
use itertools::Itertools;
use rustc_hash::FxHashSet;
use crate::{
arena::Arena,
parse::{
self, Document, Info, Method, Operation, Parameter, ParameterLocation,
ParameterStyle as ParsedParameterStyle, RefOrParameter, RefOrRequestBody, RefOrResponse,
RefOrSchema, RequestBody, Response,
path::{PathFragment, PathSegment},
},
};
use super::{
error::IrError,
transform::transform,
types::{
InlineTypePath, InlineTypePathRoot, InlineTypePathSegment,
ParameterStyle as IrParameterStyle, SchemaTypeInfo, SpecInlineType, SpecOperation,
SpecParameter, SpecParameterInfo, SpecRequest, SpecResponse, SpecSchemaType, SpecType,
TypeInfo,
},
};
/// The intermediate representation of an OpenAPI document.
///
/// A [`Spec`] is a type tree lowered from a parsed document, with references
/// still unresolved. Construct one with [`Spec::from_doc()`], then pass it to
/// [`RawGraph::new()`] to build the type graph.
///
/// [`RawGraph::new()`]: crate::ir::RawGraph::new
#[derive(Debug)]
pub struct Spec<'a> {
/// The document's `info` section: title, OpenAPI version, etc.
pub info: &'a Info,
/// All operations extracted from the document's `paths` section.
pub operations: Vec<SpecOperation<'a>>,
/// Named schemas from `components/schemas`, keyed by name.
pub schemas: IndexMap<&'a str, SpecType<'a>>,
}
impl<'a> Spec<'a> {
/// Builds a [`Spec`] from a parsed OpenAPI [`Document`].
///
/// Lowers each schema and operation to IR types, allocating all
/// long-lived data in the `arena`. Returns an error if the document is
/// malformed.
pub fn from_doc(arena: &'a Arena, doc: &'a Document) -> Result<Self, IrError> {
let schemas = match &doc.components {
Some(components) => components
.schemas
.iter()
.map(|(name, schema)| {
let ty = transform(
arena,
doc,
TypeInfo::Schema(SchemaTypeInfo {
name,
resource: schema.extension("x-resourceId"),
}),
schema,
);
(name.as_str(), ty)
})
.collect(),
None => IndexMap::new(),
};
let operations = doc
.paths
.iter()
.map(|(path, item)| {
let segments: &_ =
arena.alloc_slice_copy(&parse::path::parse(arena, path.as_str())?);
Ok(item.operations().map(move |(method, op)| PathOperation {
path: segments,
method,
params: &item.parameters,
op,
}))
})
.flatten_ok()
.map_ok(|item| -> Result<_, IrError> {
let resource = item.op.extension("x-resource-name");
let id = item
.op
.operation_id
.as_deref()
.ok_or(IrError::NoOperationId)?;
let params = {
enum Source<'a> {
Declared(&'a Parameter),
Synthesized(&'a str),
}
// Merge path item and operation parameters.
// Operation parameters override path item ones.
let mut declared = IndexMap::new();
for param in item
.params
.iter()
.chain(item.op.parameters.iter())
.filter_map(|p| match p {
RefOrParameter::Other(p) => Some(p),
RefOrParameter::Ref(r) => {
r.path.pointer().follow::<&Parameter>(doc).ok()
}
})
{
declared.insert((param.name.as_str(), param.location), param);
}
// Walk the path template to produce path parameters in
// template order. Each template parameter name pulls its
// declaration from the merged map; undeclared names get
// a synthesized string parameter.
let mut sources = {
let mut seen = FxHashSet::default();
item.path
.iter()
.flat_map(|segment| segment.fragments())
.filter_map(|fragment| match fragment {
&PathFragment::Param(name) => Some(name),
_ => None,
})
.filter(|&name| seen.insert(name))
.map(|name| {
match declared.shift_remove(&(name, ParameterLocation::Path)) {
Some(param) => Source::Declared(param),
None => Source::Synthesized(name),
}
})
.collect_vec()
};
// Append remaining parameters in declaration order.
sources.extend(declared.into_iter().filter_map(|((_, location), param)| {
match location {
// Drop declared path parameters that are
// absent from the template.
ParameterLocation::Path => None,
_ => Some(Source::Declared(param)),
}
}));
// Lower all sources to spec parameters.
let params = sources.into_iter().filter_map(|source| match source {
Source::Declared(param) => {
let ty: &_ = match ¶m.schema {
Some(RefOrSchema::Ref(r)) => arena.alloc(SpecType::Ref(&r.path)),
Some(RefOrSchema::Other(schema)) => arena.alloc(transform(
arena,
doc,
InlineTypePath {
root: InlineTypePathRoot::Resource(resource),
segments: arena.alloc_slice_copy(&[
InlineTypePathSegment::Operation(id),
InlineTypePathSegment::Parameter(param.name.as_str()),
]),
},
schema,
)),
None => arena.alloc(
SpecInlineType::Any(InlineTypePath {
root: InlineTypePathRoot::Resource(resource),
segments: arena.alloc_slice_copy(&[
InlineTypePathSegment::Operation(id),
InlineTypePathSegment::Parameter(param.name.as_str()),
]),
})
.into(),
),
};
let style = match (param.style, param.explode) {
(Some(ParsedParameterStyle::DeepObject), Some(true) | None) => {
Some(IrParameterStyle::DeepObject)
}
(
Some(ParsedParameterStyle::SpaceDelimited),
Some(false) | None,
) => Some(IrParameterStyle::SpaceDelimited),
(Some(ParsedParameterStyle::PipeDelimited), Some(false) | None) => {
Some(IrParameterStyle::PipeDelimited)
}
(None, None) => None,
(Some(ParsedParameterStyle::Form) | None, Some(true) | None) => {
Some(IrParameterStyle::Form { exploded: true })
}
(Some(ParsedParameterStyle::Form) | None, Some(false)) => {
Some(IrParameterStyle::Form { exploded: false })
}
_ => None,
};
let info = SpecParameterInfo {
name: param.name.as_str(),
ty,
required: param.required,
description: param.description.as_deref(),
style,
};
Some(match param.location {
ParameterLocation::Path => SpecParameter::Path(info),
ParameterLocation::Query => SpecParameter::Query(info),
_ => return None,
})
}
Source::Synthesized(name) => {
let ty: &_ = arena.alloc(
SpecInlineType::Any(InlineTypePath {
root: InlineTypePathRoot::Resource(resource),
segments: arena.alloc_slice_copy(&[
InlineTypePathSegment::Operation(id),
InlineTypePathSegment::Parameter(name),
]),
})
.into(),
);
Some(SpecParameter::Path(SpecParameterInfo {
name,
ty,
required: true,
description: None,
style: None,
}))
}
});
arena.alloc_slice(params)
};
let request = item
.op
.request_body
.as_ref()
.and_then(|request_or_ref| {
let request = match request_or_ref {
RefOrRequestBody::Other(rb) => rb,
RefOrRequestBody::Ref(r) => {
r.path.pointer().follow::<&RequestBody>(doc).ok()?
}
};
Some(if request.content.contains_key("multipart/form-data") {
RequestContent::Multipart
} else if let Some(content) = request.content.get("application/json")
&& let Some(schema) = &content.schema
{
RequestContent::Json(schema)
} else if let Some(content) = request.content.get("*/*")
&& let Some(schema) = &content.schema
{
RequestContent::Json(schema)
} else {
RequestContent::Any
})
})
.map(|content| match content {
RequestContent::Multipart => SpecRequest::Multipart,
RequestContent::Json(RefOrSchema::Ref(r)) => {
SpecRequest::Json(arena.alloc(SpecType::Ref(&r.path)))
}
RequestContent::Json(RefOrSchema::Other(schema)) => {
SpecRequest::Json(arena.alloc(transform(
arena,
doc,
InlineTypePath {
root: InlineTypePathRoot::Resource(resource),
segments: arena.alloc_slice_copy(&[
InlineTypePathSegment::Operation(id),
InlineTypePathSegment::Request,
]),
},
schema,
)))
}
RequestContent::Any => SpecRequest::Json(
arena.alloc(
SpecInlineType::Any(InlineTypePath {
root: InlineTypePathRoot::Resource(resource),
segments: arena.alloc_slice_copy(&[
InlineTypePathSegment::Operation(id),
InlineTypePathSegment::Request,
]),
})
.into(),
),
),
});
let response = {
let mut statuses = item
.op
.responses
.keys()
.filter_map(|status| Some((status.as_str(), status.parse::<u16>().ok()?)))
.collect_vec();
statuses.sort_unstable_by_key(|&(_, code)| code);
let key = statuses
.iter()
.find(|&(_, code)| matches!(code, 200..300))
.map(|&(key, _)| key)
.unwrap_or("default");
item.op
.responses
.get(key)
.and_then(|response_or_ref| {
let response = match response_or_ref {
RefOrResponse::Other(r) => r,
RefOrResponse::Ref(r) => {
r.path.pointer().follow::<&Response>(doc).ok()?
}
};
response.content.as_ref()
})
.map(|content| {
if let Some(content) = content.get("application/json")
&& let Some(schema) = &content.schema
{
ResponseContent::Json(schema)
} else if let Some(content) = content.get("*/*")
&& let Some(schema) = &content.schema
{
ResponseContent::Json(schema)
} else {
ResponseContent::Any
}
})
.map(|content| match content {
ResponseContent::Json(RefOrSchema::Ref(r)) => {
SpecResponse::Json(arena.alloc(SpecType::Ref(&r.path)))
}
ResponseContent::Json(RefOrSchema::Other(schema)) => {
SpecResponse::Json(arena.alloc(transform(
arena,
doc,
InlineTypePath {
root: InlineTypePathRoot::Resource(resource),
segments: arena.alloc_slice_copy(&[
InlineTypePathSegment::Operation(id),
InlineTypePathSegment::Response,
]),
},
schema,
)))
}
ResponseContent::Any => SpecResponse::Json(
arena.alloc(
SpecInlineType::Any(InlineTypePath {
root: InlineTypePathRoot::Resource(resource),
segments: arena.alloc_slice_copy(&[
InlineTypePathSegment::Operation(id),
InlineTypePathSegment::Response,
]),
})
.into(),
),
),
})
};
Ok(SpecOperation {
resource,
id,
method: item.method,
path: item.path,
description: item.op.description.as_deref(),
params,
request,
response,
})
})
.flatten_ok()
.collect::<Result<_, IrError>>()?;
Ok(Spec {
info: &doc.info,
operations,
schemas,
})
}
/// Resolves a [`SpecType`], following type references through the spec.
#[inline]
pub(super) fn resolve(&'a self, mut ty: &'a SpecType<'a>) -> ResolvedSpecType<'a> {
loop {
match ty {
SpecType::Schema(ty) => return ResolvedSpecType::Schema(ty),
SpecType::Inline(ty) => return ResolvedSpecType::Inline(ty),
SpecType::Ref(r) => ty = &self.schemas[&*r.name()],
}
}
}
}
/// A dereferenced type in the spec.
///
/// The derived [`Eq`] and [`Hash`][std::hash::Hash] implementations
/// use structural equality, not pointer identity. Multiple [`SpecType`]s
/// in a [`Spec`] may resolve to the same logical type, so value-based
/// comparison is necessary.
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub(super) enum ResolvedSpecType<'a> {
Schema(&'a SpecSchemaType<'a>),
Inline(&'a SpecInlineType<'a>),
}
#[derive(Clone, Copy, Debug)]
enum RequestContent<'a> {
Multipart,
Json(&'a RefOrSchema),
Any,
}
#[derive(Clone, Copy, Debug)]
enum ResponseContent<'a> {
Json(&'a RefOrSchema),
Any,
}
#[derive(Clone, Copy, Debug)]
struct PathOperation<'a> {
path: &'a [PathSegment<'a>],
method: Method,
params: &'a [RefOrParameter],
op: &'a Operation,
}