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s3crud.py
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s3crud.py
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# -*- coding: utf-8 -*-
""" S3 RESTful CRUD Methods
@see: U{B{I{S3XRC}} <http://eden.sahanafoundation.org/wiki/S3XRC>}
@requires: U{B{I{gluon}} <http://web2py.com>}
@requires: U{B{I{lxml}} <http://codespeak.net/lxml>}
@copyright: 2009-2012 (c) Sahana Software Foundation
@license: MIT
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
"""
from gluon import *
from gluon.dal import Row
from gluon.serializers import json as jsons
from gluon.storage import Storage
from gluon.tools import callback
try:
import json # try stdlib (Python 2.6)
except ImportError:
try:
import simplejson as json # try external module
except:
import gluon.contrib.simplejson as json # fallback to pure-Python module
from s3rest import S3Method
from s3export import S3Exporter
from s3forms import S3SQLDefaultForm
from s3widgets import S3EmbedComponentWidget
from s3utils import s3_unicode
try:
from lxml import etree
except ImportError:
import sys
print >> sys.stderr, "ERROR: lxml module needed for XML handling"
raise
# =============================================================================
class S3CRUD(S3Method):
"""
Interactive CRUD Method Handler
"""
# -------------------------------------------------------------------------
def apply_method(self, r, **attr):
"""
Apply CRUD methods
@param r: the S3Request
@param attr: dictionary of parameters for the method handler
@returns: output object to send to the view
"""
self.sqlform = self._config("crud_form", S3SQLDefaultForm())
self.settings = current.response.s3.crud
# Pre-populate create-form?
self.data = None
if r.http == "GET" and not self.record_id:
populate = attr.pop("populate", None)
if callable(populate):
try:
self.data = populate(r, **attr)
except TypeError:
self.data = None
except:
raise
elif isinstance(populate, dict):
self.data = populate
method = self.method
if r.http == "DELETE" or self.method == "delete":
output = self.delete(r, **attr)
elif method == "create":
output = self.create(r, **attr)
elif method == "read":
output = self.read(r, **attr)
elif method == "update":
output = self.update(r, **attr)
elif method == "list":
output = self.select(r, **attr)
elif method == "validate":
output = self.validate(r, **attr)
elif method == "review":
if r.record:
output = self.review(r, **attr)
else:
output = self.unapproved(r, **attr)
else:
r.error(405, current.manager.ERROR.BAD_METHOD)
return output
# -------------------------------------------------------------------------
def create(self, r, **attr):
"""
Create new records
@param r: the S3Request
@param attr: dictionary of parameters for the method handler
"""
session = current.session
request = self.request
response = current.response
resource = self.resource
table = resource.table
tablename = resource.tablename
representation = r.representation
output = dict()
# Get table configuration
_config = self._config
insertable = _config("insertable", True)
if not insertable:
if r.method is not None:
r.error(405, resource.ERROR.BAD_METHOD)
else:
return dict(form=None)
authorised = self._permitted(method="create")
if not authorised:
if r.method is not None:
r.unauthorised()
else:
return dict(form=None)
# Get callbacks
onvalidation = _config("create_onvalidation") or \
_config("onvalidation")
onaccept = _config("create_onaccept") or \
_config("onaccept")
if r.interactive:
# Configure the HTML Form
# Set view
if representation in ("popup", "iframe"):
response.view = self._view(r, "popup.html")
output["caller"] = request.vars.caller
else:
response.view = self._view(r, "create.html")
# Title and subtitle
crud_string = self.crud_string
if r.component:
title = crud_string(r.tablename, "title_display")
subtitle = crud_string(tablename, "subtitle_create")
output["title"] = title
output["subtitle"] = subtitle
else:
title = crud_string(tablename, "title_create")
output["title"] = title
# Component join
link = None
if r.component:
if resource.link is None:
link = self._embed_component(resource, record=r.id)
pkey = resource.pkey
fkey = resource.fkey
field = table[fkey]
value = r.record[pkey]
field.comment = None
field.default = value
field.update = value
if r.http=="POST":
r.post_vars.update({fkey: value})
field.readable = False
field.writable = False
else:
link = Storage(resource=resource.link, master=r.record)
# Copy record
from_table = None
from_record = r.get_vars.get("from_record", None)
map_fields = r.get_vars.get("from_fields", None)
if from_record:
del r.get_vars["from_record"] # forget it
if from_record.find(".") != -1:
from_table, from_record = from_record.split(".", 1)
from_table = current.db.get(from_table, None)
if not from_table:
r.error(404, resource.ERROR.BAD_RESOURCE)
else:
from_table = table
try:
from_record = long(from_record)
except:
r.error(404, resource.ERROR.BAD_RECORD)
authorised = current.auth.s3_has_permission("read",
from_table._tablename,
from_record)
if not authorised:
r.unauthorised()
if map_fields:
del r.get_vars["from_fields"]
if map_fields.find("$") != -1:
mf = map_fields.split(",")
mf = [f.find("$") != -1 and f.split("$") or \
[f, f] for f in mf]
map_fields = Storage(mf)
else:
map_fields = map_fields.split(",")
# Success message
message = crud_string(self.tablename, "msg_record_created")
# Copy formkey if un-deleting a duplicate
if "id" in request.post_vars:
original = str(request.post_vars.id)
formkey = session.get("_formkey[%s/None]" % tablename)
formname = "%s/%s" % (tablename, original)
session["_formkey[%s]" % formname] = formkey
if "deleted" in table:
table.deleted.writable = True
request.post_vars.update(deleted=False)
request.post_vars.update(_formname=formname, id=original)
request.vars.update(**request.post_vars)
else:
original = None
subheadings = _config("subheadings")
# Get the form
form = self.sqlform(request=request,
resource=resource,
data=self.data,
record_id=original,
from_table=from_table,
from_record=from_record,
map_fields=map_fields,
onvalidation=onvalidation,
onaccept=onaccept,
link=link,
message=message,
subheadings=subheadings,
format=representation)
# Navigate-away confirmation
if self.settings.navigate_away_confirm:
form.append(SCRIPT("S3EnableNavigateAwayConfirm();"))
# Put the form into output
output["form"] = form
# Buttons
buttons = self.insert_buttons(r, "list")
if buttons:
output["buttons"] = buttons
# Redirection
create_next = _config("create_next")
if session.s3.rapid_data_entry and not r.component:
create_next = r.url()
if representation in ("popup", "iframe"):
self.next = None
elif not create_next:
if r.component:
self.next = r.url(method="")
else:
self.next = r.url(id="[id]", method="read")
else:
try:
self.next = create_next(self)
except TypeError:
self.next = create_next
elif representation == "url":
results = self.import_url(r)
return results
elif representation == "csv":
import cgi
import csv
csv.field_size_limit(1000000000)
infile = request.vars.filename
if isinstance(infile, cgi.FieldStorage) and infile.filename:
infile = infile.file
else:
try:
infile = open(infile, "rb")
except:
session.error = current.T("Cannot read from file: %s" % infile)
redirect(r.url(method="", representation="html"))
try:
self.import_csv(infile, table=table)
except:
session.error = current.T("Unable to parse CSV file or file contains invalid data")
else:
session.confirmation = current.T("Data uploaded")
elif representation == "pdf":
from s3pdf import S3PDF
exporter = S3PDF()
return exporter(r, **attr)
else:
r.error(501, current.manager.ERROR.BAD_FORMAT)
return output
# -------------------------------------------------------------------------
def read(self, r, **attr):
"""
Read a single record
@param r: the S3Request
@param attr: dictionary of parameters for the method handler
"""
# Check authorization to read the record
authorised = self._permitted()
if not authorised:
r.unauthorised()
session = current.session
request = self.request
response = current.response
resource = self.resource
table = resource.table
tablename = resource.tablename
representation = r.representation
output = dict()
_config = self._config
editable = _config("editable", True)
deletable = _config("deletable", True)
list_fields = _config("list_fields")
# List fields
if not list_fields:
fields = resource.readable_fields()
else:
fields = [table[f] for f in list_fields if f in table.fields]
if not fields:
fields = []
if fields[0].name != table.fields[0]:
fields.insert(0, table[table.fields[0]])
# Get the target record ID
record_id = self.record_id
if r.interactive:
# If this is a single-component and no record exists,
# try to create one if the user is permitted
if not record_id and r.component and not r.multiple:
authorised = self._permitted(method="create")
if authorised:
return self.create(r, **attr)
else:
return self.select(r, **attr)
# Redirect to update if user has permission unless
# a method has been specified in the URL
if not r.method or r.method == "review":
authorised = self._permitted("update")
if authorised and representation == "html" and editable:
return self.update(r, **attr)
# Form configuration
subheadings = _config("subheadings")
# Title and subtitle
crud_string = self.crud_string
title = crud_string(r.tablename, "title_display")
output["title"] = title
if r.component:
subtitle = crud_string(tablename, "title_display")
output["subtitle"] = subtitle
# Item
if record_id:
item = self.sqlform(request=request,
resource=resource,
record_id=record_id,
readonly=True,
subheadings=subheadings,
format=representation)
else:
item = DIV(crud_string(tablename, "msg_list_empty"),
_class="empty")
# View
if representation == "html":
response.view = self._view(r, "display.html")
output["item"] = item
elif representation in ("popup", "iframe"):
response.view = self._view(r, "popup.html")
caller = attr.get("caller", None)
output["form"] = item
output["caller"] = caller
# Buttons
buttons = self.insert_buttons(r, "edit", "delete", "list",
record_id=record_id)
if buttons:
output["buttons"] = buttons
# Last update
last_update = self.last_update()
if last_update:
try:
output["modified_on"] = last_update["modified_on"]
except:
# Field not in table
pass
try:
output["modified_by"] = last_update["modified_by"]
except:
# Field not in table, such as auth_user
pass
elif representation == "plain":
T = current.T
if r.component:
record = table[record_id] if record_id else None
else:
record = r.record
if record:
# Hide empty fields from popups on map
for field in table:
if field.readable:
value = record[field]
if value is None or value == "" or value == []:
field.readable = False
item = self.sqlform(request=request,
resource=resource,
record_id=record_id,
readonly=True,
format=representation)
# Details Link
popup_url = _config("popup_url", None)
if not popup_url:
popup_url = r.url(method="read", representation="html")
if popup_url:
details_btn = A(T("Show Details"),
_href=popup_url,
_id="details-btn",
_target="_blank")
output["details_btn"] = details_btn
# Title and subtitle
title = self.crud_string(r.tablename, "title_display")
output["title"] = title
else:
item = T("Record not found")
output["item"] = item
response.view = "plain.html"
elif representation == "csv":
exporter = S3Exporter().csv
return exporter(resource)
#elif representation == "map":
# exporter = S3MAP()
# return exporter(r, **attr)
elif representation == "pdf":
exporter = S3Exporter().pdf
return exporter(r, **attr)
elif representation == "xls":
list_fields = _config("list_fields")
exporter = S3Exporter().xls
return exporter(resource, list_fields=list_fields)
elif representation == "json":
exporter = S3Exporter().json
return exporter(resource)
else:
r.error(501, current.manager.ERROR.BAD_FORMAT)
return output
# -------------------------------------------------------------------------
def update(self, r, **attr):
"""
Update a record
@param r: the S3Request
@param attr: dictionary of parameters for the method handler
"""
resource = self.resource
table = resource.table
tablename = resource.tablename
representation = r.representation
output = dict()
# Get table configuration
_config = self._config
editable = _config("editable", True)
deletable = _config("deletable", True)
# Get callbacks
onvalidation = _config("update_onvalidation") or \
_config("onvalidation")
onaccept = _config("update_onaccept") or \
_config("onaccept")
# Get the target record ID
record_id = self.record_id
if r.interactive and not record_id:
r.error(404, resource.ERROR.BAD_RECORD)
# Check if editable
if not editable:
if r.interactive:
return self.read(r, **attr)
else:
r.error(405, resource.ERROR.BAD_METHOD)
# Check permission for update
authorised = self._permitted(method="update")
if not authorised:
r.unauthorised()
if r.interactive or representation == "plain":
response = current.response
s3 = response.s3
# Form configuration
subheadings = _config("subheadings")
# Set view
if representation == "html":
response.view = self._view(r, "update.html")
elif representation in ("popup", "iframe"):
response.view = self._view(r, "popup.html")
elif representation == "plain":
response.view = self._view(r, "plain.html")
# Title and subtitle
crud_string = self.crud_string
if r.component:
title = crud_string(r.tablename, "title_display")
subtitle = crud_string(self.tablename, "title_update")
output["title"] = title
output["subtitle"] = subtitle
else:
title = crud_string(self.tablename, "title_update")
output["title"] = title
# Component join
link = None
if r.component:
if resource.link is None:
link = self._embed_component(resource, record=r.id)
pkey = resource.pkey
fkey = resource.fkey
field = table[fkey]
value = r.record[pkey]
field.comment = None
field.default = value
field.update = value
if r.http == "POST":
r.post_vars.update({fkey: value})
field.readable = False
field.writable = False
else:
link = Storage(resource=resource.link, master=r.record)
# Success message
message = crud_string(self.tablename, "msg_record_modified")
# Get the form
form = self.sqlform(request=self.request,
resource=resource,
record_id=record_id,
onvalidation=onvalidation,
onaccept=onaccept,
message=message,
link=link,
subheadings=subheadings,
format=representation)
# Navigate-away confirmation
if self.settings.navigate_away_confirm:
s3.jquery_ready.append("S3EnableNavigateAwayConfirm()")
# Put form into output
output["form"] = form
if representation == "plain":
output["item"] = form
output["title"] = ""
# Add delete and list buttons
buttons = self.insert_buttons(r, "delete",
record_id=record_id)
if buttons:
output["buttons"] = buttons
# Last update
last_update = self.last_update()
if last_update:
try:
output["modified_on"] = last_update["modified_on"]
except:
# Field not in table
pass
try:
output["modified_by"] = last_update["modified_by"]
except:
# Field not in table, such as auth_user
pass
# Redirection
update_next = _config("update_next")
if representation in ("popup", "iframe", "plain"):
self.next = None
elif not update_next:
if r.component:
self.next = r.url(method="")
else:
self.next = r.url(id="[id]", method="read")
else:
try:
self.next = update_next(self)
except TypeError:
self.next = update_next
elif representation == "url":
return self.import_url(r)
else:
r.error(501, current.manager.ERROR.BAD_FORMAT)
return output
# -------------------------------------------------------------------------
def delete(self, r, **attr):
"""
Delete record(s)
@param r: the S3Request
@param attr: dictionary of parameters for the method handler
@todo: update for link table components
"""
output = dict()
# Get table-specific parameters
config = self._config
deletable = config("deletable", True)
delete_next = config("delete_next", None)
# Check if deletable
if not deletable:
r.error(403, current.manager.ERROR.NOT_PERMITTED,
next=r.url(method=""))
# Get callback
ondelete = config("ondelete")
# Get the target record ID
record_id = self.record_id
# Check permission to delete
authorised = self._permitted()
if not authorised:
r.unauthorised()
elif r.interactive and r.http == "GET" and not record_id:
# Provide a confirmation form and a record list
form = FORM(TABLE(TR(
TD(self.settings.confirm_delete,
_style="color: red;"),
TD(INPUT(_type="submit", _value=current.T("Delete"),
_style="margin-left: 10px;")))))
items = self.select(r, **attr).get("items", None)
if isinstance(items, DIV):
output.update(form=form)
output.update(items=items)
current.response.view = self._view(r, "delete.html")
elif r.interactive and (r.http == "POST" or
r.http == "GET" and record_id):
# Delete the records, notify success and redirect to the next view
numrows = self.resource.delete(ondelete=ondelete,
format=r.representation)
if numrows > 1:
message = "%s %s" % (numrows, current.T("records deleted"))
elif numrows == 1:
message = self.crud_string(self.tablename,
"msg_record_deleted")
else:
r.error(404, current.manager.error, next=r.url(method=""))
current.response.confirmation = message
r.http = "DELETE" # must be set for immediate redirect
self.next = delete_next or r.url(method="")
elif r.http == "DELETE":
# Delete the records and return a JSON message
numrows = self.resource.delete(ondelete=ondelete,
format=r.representation)
if numrows > 1:
message = "%s %s" % (numrows, current.T("records deleted"))
elif numrows == 1:
message = self.crud_string(self.tablename,
"msg_record_deleted")
else:
r.error(404, current.manager.error, next=r.url(method=""))
item = current.xml.json_message(message=message)
current.response.view = "xml.html"
output.update(item=item)
else:
r.error(405, current.manager.ERROR.BAD_METHOD)
return output
# -------------------------------------------------------------------------
def select(self, r, **attr):
"""
Get a list view of the requested resource
@param r: the S3Request
@param attr: dictionary of parameters for the method handler
"""
from s3.s3utils import S3DataTable
session = current.session
response = current.response
s3 = response.s3
resource = self.resource
table = self.table
tablename = self.tablename
representation = r.representation
output = dict()
# Get table-specific parameters
_config = self._config
orderby = _config("orderby", None)
sortby = _config("sortby", [[1, 'asc']])
linkto = _config("linkto", None)
insertable = _config("insertable", True)
listadd = _config("listadd", True)
addbtn = _config("addbtn", False)
list_fields = _config("list_fields")
report_groupby = _config("report_groupby")
report_hide_comments = _config("report_hide_comments")
report_filename = _config("report_filename")
report_formname = _config("report_formname")
# Check permission to read in this table
authorised = self._permitted()
if not authorised:
r.unauthorised()
# Pagination
vars = self.request.get_vars
if representation == "aadata":
start = vars.get("iDisplayStart", None)
limit = vars.get("iDisplayLength", None)
else:
start = vars.get("start", None)
limit = vars.get("limit", None)
if limit is not None:
try:
start = int(start)
limit = int(limit)
except ValueError:
start = None
limit = None # use default
else:
start = None # use default
# Linkto
if not linkto:
linkto = self._linkto(r)
# List fields
if not list_fields:
fields = resource.readable_fields()
list_fields = [f.name for f in fields]
else:
fields = [table[f] for f in list_fields if f in table.fields]
if not fields:
fields = []
if not fields or \
fields[0].name != table.fields[0]:
fields.insert(0, table[table.fields[0]])
if list_fields[0] != table.fields[0]:
list_fields.insert(0, table.fields[0])
# Truncate long texts
if r.interactive or r.representation == "aadata":
for f in self.table:
if str(f.type) == "text" and not f.represent:
f.represent = self.truncate
# Filter
if s3.filter is not None:
resource.add_filter(s3.filter)
left = []
distinct = self.method == "search"
if r.interactive:
# View
response.view = self._view(r, "list.html")
# Page title
crud_string = self.crud_string
if r.component:
title = crud_string(r.tablename, "title_display")
else:
title = crud_string(self.tablename, "title_list")
output["title"] = title
# Add button and form
if insertable:
if listadd:
# Add a hidden add-form and a button to activate it
form = self.create(r, **attr).get("form", None)
if form is not None:
output["form"] = form
addtitle = crud_string(tablename, "subtitle_create")
output["addtitle"] = addtitle
showadd_btn = self.crud_button(
None,
tablename=tablename,
name="label_create_button",
_id="show-add-btn")
output["showadd_btn"] = showadd_btn
# Switch to list_create view
response.view = self._view(r, "list_create.html")
elif addbtn:
# Add an action-button linked to the create view
buttons = self.insert_buttons(r, "add")
if buttons:
output["buttons"] = buttons
# Count rows
totalrows = resource.count()
displayrows = totalrows
# How many records per page?
if s3.dataTable_iDisplayLength:
display_length = s3.dataTable_iDisplayLength
else:
display_length = 25
# Server-side pagination?
if not s3.no_sspag:
dt_pagination = "true"
if limit is None:
limit = 2 * display_length
session.s3.filter = vars
if orderby is None:
# Default initial sorting
scol = len(list_fields) > 1 and "1" or "0"
vars.update(iSortingCols="1",
iSortCol_0=scol,
sSortDir_0="asc")
q, orderby, left = resource.datatable_filter(list_fields, vars)
del vars["iSortingCols"]
del vars["iSortCol_0"]
del vars["sSortDir_0"]
if r.method == "search" and not orderby:
orderby = fields[0]
else:
dt_pagination = "false"
# Get the data table
dt = resource.datatable(fields=list_fields,
start=start,
limit=limit,
left=left,
orderby=orderby,
distinct=distinct)
# Empty table - or just no match?
if dt is None:
if "deleted" in table:
available_records = current.db(table.deleted != True)
else:
available_records = current.db(table._id > 0)
if available_records.select(table._id,
limitby=(0, 1)).first():
datatable = DIV(crud_string(tablename, "msg_no_match"),
_class="empty")
else:
datatable = DIV(crud_string(tablename, "msg_list_empty"),
_class="empty")
s3.no_formats = True
if r.component and "showadd_btn" in output:
# Hide the list and show the form by default
del output["showadd_btn"]
datatable = ""
else:
datatable = dt.html(totalrows, displayrows, "list",
dt_pagination=dt_pagination,
dt_displayLength=display_length)
# Add items to output
output["items"] = datatable
elif r.representation == "aadata":
# Get the master query for SSPag
# FixMe: don't use session to store filters; also causes resource
# filters to be discarded
if session.s3.filter is not None:
resource.build_query(filter=s3.filter,
vars=session.s3.filter)
# Count the rows
totalrows = displayrows = resource.count()
# Apply datatable filters
searchq, orderby, left = resource.datatable_filter(list_fields, vars)
if searchq is not None:
resource.add_filter(searchq)
displayrows = resource.count(left=left, distinct=True)
# Orderby fallbacks
if r.method == "search" and not orderby:
orderby = fields[0]
if orderby is None:
orderby = _config("orderby", None)
# Get a data table
dt = resource.datatable(fields=list_fields,
start=start,
limit=limit,
left=left,
orderby=orderby,
distinct=distinct)
# Echo
sEcho = int(vars.sEcho or 0)
# Representation
if dt is not None:
output = dt.json(totalrows,
displayrows,
"list",
sEcho)
else:
output = '{"iTotalRecords": %s, ' \
'"iTotalDisplayRecords": 0,' \
'"dataTable_id": "list", ' \
'"sEcho": %s, ' \