diff options
Diffstat (limited to 'tutorius/constraints.py')
| -rw-r--r-- | tutorius/constraints.py | 61 |
1 files changed, 53 insertions, 8 deletions
diff --git a/tutorius/constraints.py b/tutorius/constraints.py index e91f23a..cd71167 100644 --- a/tutorius/constraints.py +++ b/tutorius/constraints.py @@ -24,6 +24,14 @@ for some properties. # For the File Constraint import os +# For the Resource Constraint +import re + +class ConstraintException(Exception): + """ + Parent class for all constraint exceptions + """ + pass class Constraint(): """ @@ -47,7 +55,7 @@ class ValueConstraint(Constraint): def __init__(self, limit): self.limit = limit -class UpperLimitConstraintError(Exception): +class UpperLimitConstraintError(ConstraintException): pass class UpperLimitConstraint(ValueConstraint): @@ -64,7 +72,7 @@ class UpperLimitConstraint(ValueConstraint): raise UpperLimitConstraintError() return -class LowerLimitConstraintError(Exception): +class LowerLimitConstraintError(ConstraintException): pass class LowerLimitConstraint(ValueConstraint): @@ -81,7 +89,7 @@ class LowerLimitConstraint(ValueConstraint): raise LowerLimitConstraintError() return -class MaxSizeConstraintError(Exception): +class MaxSizeConstraintError(ConstraintException): pass class MaxSizeConstraint(ValueConstraint): @@ -99,7 +107,7 @@ class MaxSizeConstraint(ValueConstraint): raise MaxSizeConstraintError("Setter : trying to set value of length %d while limit is %d"%(len(value), self.limit)) return -class MinSizeConstraintError(Exception): +class MinSizeConstraintError(ConstraintException): pass class MinSizeConstraint(ValueConstraint): @@ -117,7 +125,7 @@ class MinSizeConstraint(ValueConstraint): raise MinSizeConstraintError("Setter : trying to set value of length %d while limit is %d"%(len(value), self.limit)) return -class ColorConstraintError(Exception): +class ColorConstraintError(ConstraintException): pass class ColorArraySizeError(ColorConstraintError): @@ -153,7 +161,7 @@ class ColorConstraint(Constraint): return -class BooleanConstraintError(Exception): +class BooleanConstraintError(ConstraintException): pass class BooleanConstraint(Constraint): @@ -165,7 +173,7 @@ class BooleanConstraint(Constraint): return raise BooleanConstraintError("Value is not True or False") -class EnumConstraintError(Exception): +class EnumConstraintError(ConstraintException): pass class EnumConstraint(Constraint): @@ -190,7 +198,7 @@ class EnumConstraint(Constraint): raise EnumConstraintError("Value is not part of the enumeration") return -class FileConstraintError(Exception): +class FileConstraintError(ConstraintException): pass class FileConstraint(Constraint): @@ -208,3 +216,40 @@ class FileConstraint(Constraint): raise FileConstraintError("Non-existing file : %s"%value) return +class ResourceConstraintError(ConstraintException): + pass + +class ResourceConstraint(Constraint): + """ + Ensures that the value is looking like a resource name, like + <filename>_<GUID>[.<extension>]. We are not validating that this is a + valid resource for the reason that the property does not have any notion + of tutorial guid. + + TODO : Find a way to properly validate resources by looking them up in the + Vault. + """ + + # Regular expression to parse a resource-like name + resource_regexp_text = "(.+)_([a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12})(\..*)?$" + resource_regexp = re.compile(resource_regexp_text) + + def validate(self, value): + # TODO : Validate that we will not use an empty resource or if we can + # have transitory resource names + if value is None: + raise ResourceConstraintError("Resource not allowed to have a null value!") + + # Special case : We allow the empty resource name for now + if value == "": + return value + + # Attempt to see if the value has a resource name inside it + match = self.resource_regexp.search(value) + + # If there was no match on the reg exp + if not match: + raise ResourceConstraintError("Resource name does not seem to be valid : %s" % value) + + # If the name matched, then the value is _PROBABLY_ good + return value |