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"""
This contains the FastAPI web application and RESTful API.
So far there are few endpoints, so we just put them all here!
"""
import sys
import babel.support
from fastapi import FastAPI, APIRouter, Request, Depends, Response
from fastapi.staticfiles import StaticFiles
from dynaconf import settings
from typing import Optional, Any
from fatcat_scholar.hacks import Jinja2Templates
from fatcat_scholar.search import do_fulltext_search, FulltextQuery, FulltextHits
print(f"dynaconf settings: {settings.as_dict()}", file=sys.stderr)
I18N_LANG_TRANSLATIONS = ["de", "zh"]
I18N_LANG_OPTIONS = I18N_LANG_TRANSLATIONS + [
settings.I18N_LANG_DEFAULT,
]
class LangPrefix:
"""
Looks for a two-character language prefix.
If there is no such prefix, in the future it could also look at the
Accept-Language header and try to infer a language from that, while not
setting the prefix code.
"""
def __init__(self, request: Request):
self.prefix: str = ""
self.code: str = settings.I18N_LANG_DEFAULT
for lang_option in I18N_LANG_OPTIONS:
if request.url.path.startswith(f"/{lang_option}/"):
self.prefix = f"/{lang_option}"
self.code = lang_option
break
class ContentNegotiation:
"""
Choses a mimetype to return based on Accept header.
Intended to be used for RESTful content negotiation from web endpoints to API.
"""
def __init__(self, request: Request):
self.mimetype = "text/html"
if request.headers.get("accept", "").startswith("application/json"):
self.mimetype = "application/json"
api = APIRouter()
@api.get("/", operation_id="get_home")
async def home() -> Any:
return {"endpoints": {"/": "this", "/search": "fulltext search"}}
@api.get("/search", operation_id="get_search")
async def search(query: FulltextQuery = Depends(FulltextQuery)) -> Any:
return {"message": "search results would go here, I guess"}
web = APIRouter()
def locale_gettext(translations: Any) -> Any:
def gt(s): # noqa: ANN001,ANN201
return translations.ugettext(s)
return gt
def locale_ngettext(translations: Any) -> Any:
def ngt(s, n): # noqa: ANN001,ANN201
return translations.ungettext(s)
return ngt
def load_i18n_templates() -> Any:
"""
This is a hack to work around lack of per-request translation
(babel/gettext) locale switching in FastAPI and Starlette. Flask (and
presumably others) get around this using global context (eg, in
Flask-Babel).
See related issues:
- https://github.com/encode/starlette/issues/279
- https://github.com/aio-libs/aiohttp-jinja2/issues/187
"""
d = dict()
for lang_opt in I18N_LANG_OPTIONS:
translations = babel.support.Translations.load(
dirname="fatcat_scholar/translations", locales=[lang_opt],
)
templates = Jinja2Templates(
directory="fatcat_scholar/templates", extensions=["jinja2.ext.i18n"],
)
templates.env.install_gettext_translations(translations, newstyle=True)
templates.env.install_gettext_callables(
locale_gettext(translations), locale_ngettext(translations), newstyle=True,
)
# remove a lot of whitespace in HTML output with these configs
templates.env.trim_blocks = True
templates.env.lstrip_blocks = True
# pass-through application settings to be available in templates
templates.env.globals["settings"] = settings
d[lang_opt] = templates
return d
i18n_templates = load_i18n_templates()
@web.get("/", include_in_schema=False)
async def web_home(
request: Request,
lang: LangPrefix = Depends(LangPrefix),
content: ContentNegotiation = Depends(ContentNegotiation),
) -> Any:
if content.mimetype == "application/json":
return await home()
return i18n_templates[lang.code].TemplateResponse(
"home.html",
{"request": request, "locale": lang.code, "lang_prefix": lang.prefix},
)
@web.get("/about", include_in_schema=False)
async def web_about(request: Request, lang: LangPrefix = Depends(LangPrefix)) -> Any:
return i18n_templates[lang.code].TemplateResponse(
"about.html",
{"request": request, "locale": lang.code, "lang_prefix": lang.prefix},
)
@web.get("/help", include_in_schema=False)
async def web_help(request: Request, lang: LangPrefix = Depends(LangPrefix)) -> Any:
return i18n_templates[lang.code].TemplateResponse(
"help.html",
{"request": request, "locale": lang.code, "lang_prefix": lang.prefix},
)
@web.get("/search", include_in_schema=False)
async def web_search(
request: Request,
response: Response,
query: FulltextQuery = Depends(FulltextQuery),
lang: LangPrefix = Depends(LangPrefix),
content: ContentNegotiation = Depends(ContentNegotiation),
) -> Any:
if content.mimetype == "application/json":
return await search(query)
hits: Optional[FulltextHits] = None
search_error: Optional[dict] = None
status_code: int = 200
if query.q is not None:
try:
hits = do_fulltext_search(query)
except ValueError as e:
search_error = dict(type="query", message=str(e))
status_code = 400
except IOError as e:
search_error = dict(type="backend", message=str(e))
status_code = 500
headers = dict()
if hits and hits.query_wall_time_ms:
headers["Server-Timing"] = f'es_wall;desc="Search API Request";dur={hits.query_wall_time_ms}'
if hits.query_time_ms:
headers["Server-Timing"] += f', es;desc="Search Internal Time";dur={hits.query_time_ms}'
return i18n_templates[lang.code].TemplateResponse(
"search.html",
{
"request": request,
"locale": lang.code,
"lang_prefix": lang.prefix,
"hits": hits,
"search_error": search_error,
"query": query,
},
headers=headers,
status_code=status_code,
)
app = FastAPI(
title="Fatcat Scholar",
description="Fulltext search interface for scholarly web content in the Fatcat catalog. An Internet Archive project.",
version="0.1.0-dev",
openapi_url="/api/openapi.json",
redoc_url="/api/redoc",
docs_url="/api/docs",
)
app.include_router(web)
for lang_option in I18N_LANG_OPTIONS:
app.include_router(web, prefix=f"/{lang_option}")
# Becasue we are mounting 'api' after 'web', the web routes will take
# precedence. Requests get passed through the API handlers based on content
# negotiation. This is counter-intuitive here in the code, but does seem to
# work, and results in the OpenAPI docs looking correct.
app.include_router(api)
app.mount("/static", StaticFiles(directory="fatcat_scholar/static"), name="static")
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