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Allow changing expiration date

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Mia Herkt 2022-11-30 02:16:19 +01:00
parent afe2329bf5
commit e168534258
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2 changed files with 48 additions and 33 deletions

View file

@ -158,6 +158,34 @@ class File(db.Model):
self.removed = permanent
self.getpath().unlink(missing_ok=True)
# Returns the epoch millisecond that a file should expire
#
# Uses the expiration time provided by the user (requested_expiration)
# upper-bounded by an algorithm that computes the size based on the size of the
# file.
#
# That is, all files are assigned a computed expiration, which can voluntarily
# shortened by the user either by providing a timestamp in epoch millis or a
# duration in hours.
def get_expiration(requested_expiration, size) -> int:
current_epoch_millis = time.time() * 1000;
# Maximum lifetime of the file in milliseconds
this_files_max_lifespan = get_max_lifespan(size);
# The latest allowed expiration date for this file, in epoch millis
this_files_max_expiration = this_files_max_lifespan + 1000 * time.time();
if requested_expiration is None:
return this_files_max_expiration
elif requested_expiration < 1650460320000:
# Treat the requested expiration time as a duration in hours
requested_expiration_ms = requested_expiration * 60 * 60 * 1000
return min(this_files_max_expiration, current_epoch_millis + requested_expiration_ms)
else:
# Treat the requested expiration time as a timestamp in epoch millis
return min(this_files_max_expiration, requested_expiration)
"""
requested_expiration can be:
- None, to use the longest allowed file lifespan
@ -203,33 +231,7 @@ class File(db.Model):
return ext[:app.config["FHOST_MAX_EXT_LENGTH"]] or ".bin"
# Returns the epoch millisecond that this file should expire
#
# Uses the expiration time provided by the user (requested_expiration)
# upper-bounded by an algorithm that computes the size based on the size of the
# file.
#
# That is, all files are assigned a computed expiration, which can voluntarily
# shortened by the user either by providing a timestamp in epoch millis or a
# duration in hours.
def get_expiration() -> int:
current_epoch_millis = time.time() * 1000;
# Maximum lifetime of the file in milliseconds
this_files_max_lifespan = get_max_lifespan(len(data));
# The latest allowed expiration date for this file, in epoch millis
this_files_max_expiration = this_files_max_lifespan + 1000 * time.time();
if requested_expiration is None:
return this_files_max_expiration
elif requested_expiration < 1650460320000:
# Treat the requested expiration time as a duration in hours
requested_expiration_ms = requested_expiration * 60 * 60 * 1000
return min(this_files_max_expiration, current_epoch_millis + requested_expiration_ms)
else:
# Treat the requested expiration time as a timestamp in epoch millis
return min(this_files_max_expiration, requested_expiration);
expiration = File.get_expiration(requested_expiration, len(data))
isnew = True
f = File.query.filter_by(sha256=digest).first()
@ -240,18 +242,17 @@ class File(db.Model):
abort(451)
if f.expiration is None:
# The file has expired, so give it a new expiration date
f.expiration = get_expiration()
f.expiration = expiration
# Also generate a new management token
f.mgmt_token = secrets.token_urlsafe()
else:
# The file already exists, update the expiration if needed
f.expiration = max(f.expiration, get_expiration())
f.expiration = max(f.expiration, expiration)
isnew = False
else:
mime = get_mime()
ext = get_ext(mime)
expiration = get_expiration()
mgmt_token = secrets.token_urlsafe()
f = File(digest, ext, mime, addr, expiration, mgmt_token)
@ -386,6 +387,16 @@ def manage_file(f):
f.delete()
db.session.commit()
return ""
if "expires" in request.form:
try:
requested_expiration = int(request.form["expires"])
except ValueError:
abort(400)
fsize = f.getpath().stat().st_size
f.expiration = File.get_expiration(requested_expiration, fsize)
db.session.commit()
return "", 202
abort(400)

View file

@ -13,17 +13,21 @@ File URLs are valid for at least 30 days and up to a year (see below).
Shortened URLs do not expire.
Files can be set to expire sooner by adding an "expires" parameter (in hours)
curl -F'file=@yourfile.png' -F'expires=24' {{ fhost_url }}
curl -F'file=@yourfile.png' -Fexpires=24 {{ fhost_url }}
OR by setting "expires" to a timestamp in epoch milliseconds
curl -F'file=@yourfile.png' -F'expires=1681996320000' {{ fhost_url }}
curl -F'file=@yourfile.png' -Fexpires=1681996320000 {{ fhost_url }}
Expired files won't be removed immediately, but will be removed as part of
the next purge.
Whenever a file that does not already exist or has expired is uploaded,
the HTTP response header includes an X-Token field. You can use this
to delete the file immediately:
to perform management operations on the file.
To delete the file immediately:
curl -Ftoken=token_here -Fdelete= {{ fhost_url }}/abc.txt
To change the expiration date (see above):
curl -Ftoken=token_here -Fexpires=3 {{ fhost_url }}/abc.txt
{% set max_size = config["MAX_CONTENT_LENGTH"]|filesizeformat(True) %}
Maximum file size: {{ max_size }}