Remove multi currencies support

For more information about the rationale, this was [discussed](#1232 (comment)) in our bugtracker.

CHANGELOG.md

@@ -2,8 +2,9 @@
 
 This document describes changes between each past release.
 
-## 6.2.0 (unreleased)
+## 7.0.0 (unreleased)
 
+- Remove the support for multiple currencies, [as discussed](https://github.com/spiral-project/ihatemoney/issues/1232#issuecomment-2081517453) in our bugtracker.
 - Add support for python 3.12 (#757)
 - Remove support for python 3.7
 - Replace the black linter by ruff

docs/api.md

@@ -71,13 +71,6 @@ A project needs the following arguments:
 -   `password`: the project password / private code (string)
 -   `contact_email`: the contact email, used to recover the private code (string)
 
-Optional arguments:
-
--   `default_currency`: the default currency to use for a multi-currency
-    project, in ISO 4217 format. Bills are converted to this currency
-    for operations like balance or statistics. Default value: `XXX` (no
-    currency).
-
 Here is the command:
 
     $ curl -X POST https://ihatemoney.org/api/projects \
@@ -97,7 +90,6 @@ Getting information about the project:
         "id": "demo",
         "name": "demonstration",
         "contact_email": "[email protected]",
-        "default_currency": "XXX",
         "members": [{"id": 11515, "name": "f", "weight": 1.0, "activated": true, "balance": 0},
                     {"id": 11531, "name": "g", "weight": 1.0, "activated": true, "balance": 0},
                     {"id": 11532, "name": "peter", "weight": 1.0, "activated": true, "balance": 5.0},
@@ -181,14 +173,8 @@ Or get a specific bill by ID:
       "creation_date": "2021-01-13",
       "what": "Raclette du nouvel an",
       "external_link": "",
-      "original_currency": "XXX",
-      "converted_amount": 100
     }
 
-`amount` is expressed in the `original_currency` of the bill, while
-`converted_amount` is expressed in the project `default_currency`. Here,
-they are the same.
-
 Add a bill with a `POST` query on `/api/projects/<id>/bills`. You need
 the following required parameters:
 
@@ -203,9 +189,6 @@ And optional parameters:
 
 -   `date`: the date of the bill (`yyyy-mm-dd` format). Defaults to
     current date if not provided.
--   `original_currency`: the currency in which `amount` has been paid
-    (ISO 4217 code). Only makes sense for a project with currencies.
-    Defaults to the project `default_currency`.
 -   `external_link`: an optional URL associated with the bill.
 
 Returns the id of the created bill :
@@ -250,23 +233,3 @@ You can get some project stats with a `GET` on
             "balance": -10.5
         }
     ]
-
-### Currencies
-
-You can get a list of supported currencies with a `GET` on
-`/api/currencies`:
-
-    $ curl --basic https://ihatemoney.org/api/currencies
-    [
-        "XXX",
-        "AED",
-        "AFN",
-        .
-        .
-        .
-        "ZAR",
-        "ZMW",
-        "ZWL"
-    ]
-
-

ihatemoney/api/common.py

@@ -5,7 +5,6 @@
 from werkzeug.security import check_password_hash
 from wtforms.fields import BooleanField
 
-from ihatemoney.currency_convertor import CurrencyConverter
 from ihatemoney.emails import send_creation_email
 from ihatemoney.forms import EditProjectForm, MemberForm, ProjectForm, get_billform_for
 from ihatemoney.models import Bill, Person, Project, db
@@ -50,13 +49,6 @@ def wrapper(*args, **kwargs):
     return wrapper
 
 
-class CurrenciesHandler(Resource):
-    currency_helper = CurrencyConverter()
-
-    def get(self):
-        return self.currency_helper.get_currencies()
-
-
 class ProjectsHandler(Resource):
     def post(self):
         form = ProjectForm(meta={"csrf": False})

ihatemoney/api/v1/resources.py

@@ -5,7 +5,6 @@
 from ihatemoney.api.common import (
     BillHandler,
     BillsHandler,
-    CurrenciesHandler,
     MemberHandler,
     MembersHandler,
     ProjectHandler,
@@ -18,7 +17,6 @@
 CORS(api)
 restful_api = Api(api)
 
-restful_api.add_resource(CurrenciesHandler, "/currencies")
 restful_api.add_resource(ProjectsHandler, "/projects")
 restful_api.add_resource(ProjectHandler, "/projects/<string:project_id>")
 restful_api.add_resource(TokenHandler, "/projects/<string:project_id>/token")