def create_diploma_transaction():
"""
Method that gives a diploma to a student. It gets the asset name of the university currency and sends a unit
of that asset to the multisignature student+university. Then it creates a multisignature transfer from the
multisignature student+university to university+high authority and signs it. It also adds the cnp(student id)+hash
as metadata and adds the diploma to the database.
Args:
multisig_address (str): the multisignature of student+university.
stud_cnp (str): the id of the student.
diploma_hash (str): the hash of the diploma.
diploma_name (str): the name of the diploma.
Returns:
(html): the university page.
(dict): response variable that contains the students, diplomas and the hexblob of the
transaction that the student must sign.
"""
response = dict()
multisig_address = request.args.get("multisig_address")
stud_cnp = request.args.get("stud_cnp")
diploma_hash = request.args.get("diploma_hash")
diploma_name = request.args.get("diploma_name")
asset_name = MultichainCLI.get_asset_name()
error = MultichainCLI.send_asset(multisig_address, asset_name)
print("Student cnp: {}".format(stud_cnp))
if not error:
time.sleep(0.5)
asset_dest_addr = MultichainCLI.get_destination_addr_asset(asset_name)
hexblob, errors = MultichainCLI.create_raw_trans(multisig_address, asset_dest_addr, asset_name, stud_cnp + diploma_hash)
if errors:
response["create_hexblob"] = "Multisignature with the high authority was not created. Please create the " \
"multisignature before issuing any diploma."
else:
response["create_hexblob"] = "Hexblob: {}".format(hexblob["hex"])
diploma = Diploma(hash=diploma_hash, name=diploma_name, student_cnp=stud_cnp)
db.session.add(diploma)
db.session.commit()
students = Student.query.all()
response["students"] = students_schema.dump(students).data
diplomas = Diploma.query.all()
response["diplomas"] = diplomas_schema.dump(diplomas).data
return render_template("university.html", response=response)
def revoke_diploma_transaction():
"""
Method that revokes a diploma from a student. It creates a multisignature transfer from the multisignature
between univ+high authority to the burn address.
Args:
stud_cnp (str): the id of the student.
diploma_hash (str): the hash of the diploma.
Returns:
(html): the university page.
(dict): response variable that contains the students, diplomas and the hexblob of the
transaction that the high authority must sign.
"""
response = dict()
stud_cnp = request.args.get("stud_cnp")
diploma_hash = request.args.get("diploma_hash")
asset_name = MultichainCLI.get_asset_name()
asset_dest_addr = MultichainCLI.get_destination_addr_asset(asset_name)
burn_address = MultichainCLI.get_burn_address()
hexblob, _ = MultichainCLI.create_raw_trans(asset_dest_addr, burn_address, asset_name, stud_cnp + diploma_hash)
response["revoke_hexblob"] = "Hexblob: {}".format(hexblob["hex"])
db.session.execute("delete from diploma where hash = '{}'".format(diploma_hash))
db.session.commit()
students = Student.query.all()
response["students"] = students_schema.dump(students).data
diplomas = Diploma.query.all()
response["diplomas"] = diplomas_schema.dump(diplomas).data
return render_template("university.html", response=response)