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https://github.com/HackSoftware/simple_schema_validator
A dead-simple utility that validates if object has a certain structure. Used in some of our projects.
https://github.com/HackSoftware/simple_schema_validator
Last synced: 13 days ago
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A dead-simple utility that validates if object has a certain structure. Used in some of our projects.
- Host: GitHub
- URL: https://github.com/HackSoftware/simple_schema_validator
- Owner: HackSoftware
- License: mit
- Created: 2019-02-06T08:38:28.000Z (almost 6 years ago)
- Default Branch: master
- Last Pushed: 2020-07-07T20:10:26.000Z (over 4 years ago)
- Last Synced: 2024-07-05T15:11:32.460Z (4 months ago)
- Language: Python
- Homepage:
- Size: 80.1 KB
- Stars: 26
- Watchers: 9
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# Simple schema validator
- [Simple schema validator](#simple-schema-validator)
- [Basic usage](#basic-usage)
- [Type checking](#type-checking)
- [Optional types](#optional-types)
A dead-simple utility that validates if object has a certain structure. Used in some of our projects.
## Basic usage
```
pip install simple_schema_validator
```
An example:
Lets say we have an API that returns the following data:
```json
{
"user": 1,
"profile": {
"email": "[email protected]",
"name": "Some User",
"age": 20
},
"tokens": {
"jwt": "...",
"refresh": "...",
"firebase": "...",
}
}
```
And we are writing a simple integration test, that wants to assure the response has a certain structure.
Then we can use the schema validator like so:
```python
from simple_schema_validator import schema_validator
data = get_data_from_api()
schema = {
'user': Any,
'profile': {
'email': Any,
'name': Any,
'age': Any
},
'tokens': {
'jwt': Any,
'refresh': Any,
'firebase': Any
}
}
validation = schema_validator(schema, data)
if not validation:
print(f'Keys in data, but not in schema: {validation.additional_keys}')
print(f'Keys in schema, but not in data: {validation.missing_keys}')
print(f'Keys with different type from schema {validation.type_errors}')
```
* `missing_keys` are those keys that are required in the `schema`, but not found in `data`.
* `additional_keys` are those keys present in `data`, but not required by the `schema`.
* `validation_errors` are those keys, that are having a different type in `data`, from the defined in `schema`.
**Nested keys are represented with "dot" notation - `profile.email`, `tokens.jwt`, etc.**
## Type checking
The util supports simple schema type checking.
Currently, the supported types in the schema are:
* `int`
* `float`
* `str`
* `bool`
* `typing.Any` (from Python `typing` library)
* `simple_schema_validator.types.Optional` (custom type, define in the package)
If the type is `Any`, no type checking is done.
If there's a type mismatch, the errors are placed in the `type_errors` attribute of the result, which is a list of type errors.
The general format of a single type error is:
```python
{
'path': 'the.path.to.the.value.in.data',
'expected': the_expected_type_as_defined_in_the_schema,
'actual': the_actual_type_of_the_value
}
```
Here's an example:
```python
from simple_schema_validator import schema_validator, types
schema = {
'user': str,
'profile': {
'email': str,
'name': str,
'age': int
},
'tokens': {
'jwt': str,
'refresh': str,
'firebase': str
}
}
data = {
'user': 'Some User',
'profile': {
'email': '[email protected]',
'name': 'Some User',
'age': "29"
},
'tokens': {
'jwt': 'some token value',
'refresh': 'some token value',
'firebase': 'some token value'
}
}
result = schema_validator(schema, data)
assert bool(result) is False
assert result.type_errors == [{'path': 'profile.age', 'expected': int, 'actual': str}]
```
### Optional types
The schema validator support optional types.
You can do the following:
```python
from simple_schema_validator import schema_validator, types
schema = {
'a': types.Optional[int]
}
data_1 = {
'a': None
}
data_2 = {
'a': 1
}
data_3 = {
'a': 'some_string'
}
assert bool(schema_validator(schema, data_1)) is True
assert bool(schema_validator(schema, data_2)) is True
assert bool(schema_validator(schema, data_3)) is False
```
Additionally, you can define optional branches in the schema:
```python
from simple_schema_validator import schema_validator, types
schema = {
'a': types.Optional[{
'b': int
}]
}
data_1 = {
'a': None
}
data_2 = {
'a': 1
}
data_3 = {
'a': {
'b': 1
}
}
data_4 = {
'a': {
'b': 'some_string'
}
}
assert bool(schema_validator(schema, data_1)) is True
assert bool(schema_validator(schema, data_2)) is False
assert bool(schema_validator(schema, data_3)) is True
assert bool(schema_validator(schema, data_4)) is False
```
You can use it with optional lists aswell:
```python
from simple_schema_validator import schema_validator, types
schema = {
'a': types.Optional[[int]]
}
data_1 = {
'a': None
}
data_2 = {
'a': 1
}
data_3 = {
'a': [1, 2, 3]
}
data_4 = {
'a': ['some_string']
}
assert bool(schema_validator(schema, data_1)) is True
assert bool(schema_validator(schema, data_2)) is False
assert bool(schema_validator(schema, data_3)) is True
assert bool(schema_validator(schema, data_4)) is False
```
### List types
The schema validator support list types.
You can do the following:
```python
from simple_schema_validator import schema_validator, types
schema = {
'a': types.List[int]
}
data_1 = {
'a': [1, 2, 3]
}
data_3 = {
'a': ['some_string']
}
assert bool(schema_validator(schema, data_1)) is True
assert bool(schema_validator(schema, data_2)) is False
```
### Recursive schemas
The schema validator support type checking for schemas in list.
You can do the following:
```python
from simple_schema_validator import schema_validator, types
schema = {
'a': [{'b': int}]
}
data_1 = {
'a': [{'b': 1}]
}
data_2 = {
'a': [{'b': 'some_string'}]
}
assert bool(schema_validator(schema, data_1)) is True
assert bool(schema_validator(schema, data_2)) is False
```
```python
from simple_schema_validator import schema_validator, types
schema = {
'a': [{'b': [int]}]
}
data_1 = {
'a': [{'b': [1]}]
}
data_2 = {
'a': [{'b': [1, 2, 3]}]
}
data_3 = {
'a': [{'b': ['some_string']}]
}
data_4 = {
'a': [{'b': [1, 'some_string']}]
}
data_5 = {
'a': [{'b': ['some_string', 'other_string']}]
}
data_6 = {
'a': [{'b': ['some_string', 1]}]
}
assert bool(schema_validator(schema, data_1)) is True
assert bool(schema_validator(schema, data_2)) is True
assert bool(schema_validator(schema, data_3)) is False
assert bool(schema_validator(schema, data_4)) is False
assert bool(schema_validator(schema, data_5)) is False
assert bool(schema_validator(schema, data_6)) is False
```
You can do the same with optional branches aswell:
```python
from simple_schema_validator import schema_validator, types
schema = {
'a': [{'b': types.Optional[int]}]
}
data_1 = {
'a': [{
'b': {
'c': 1,
'd': 2
}
}]
}
data_2 = {
'a': [{'b': 'some_string'}]
}
assert bool(schema_validator(schema, data_1)) is True
assert bool(schema_validator(schema, data_2)) is False
```
## Examples
For examples, check the [examples](examples/) folder or the [tests](tests/) for the project.