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collection.js
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collection.js
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const locreq = require("locreq")(__dirname);
const Promise = require("bluebird");
const assert = require("assert");
const merge = require("merge");
const clone = require("clone");
const Errors = locreq("lib/response/error.js");
const Chip = require("./chip.js");
const Field = require("./field.js");
const CalculatedField = require("./calculated-field.js");
const AccessStrategy = require("./access-strategy.js");
const AccessStrategyType = locreq("lib/chip-types/access-strategy-type.js");
const SingleItemResponse = locreq(
"common_lib/response/single-item-response.js"
);
const Collection = function(app, declaration) {
if (typeof declaration === "string") {
return app.ChipManager.get_chip("collection", declaration);
} else if (declaration instanceof Collection) {
return declaration;
}
const self = this;
Chip.call(this, "collection", declaration.name);
this.app = app;
this.name = declaration.name;
this.fields = {};
this.human_readable_name = declaration.human_readable_name;
this.summary = declaration.summary;
this.display_hints = declaration.display_hints || {};
this.access_strategy = {
default: new AccessStrategy(app, "public", {}),
};
assert(
declaration.named_filters === undefined ||
typeof declaration.named_filters === "object"
);
this.named_filters = declaration.named_filters || [];
if (declaration) {
if (declaration.fields) {
for (let i = 0; i < declaration.fields.length; i++) {
if (declaration.fields[i].params) {
if (typeof declaration.fields[i].params !== "object") {
throw new Errors.ValidationError(
`In field "${
declaration.fields[i].name
}": "params" is of wrong type, it should be an object`
);
}
}
}
this.add_fields(declaration.fields);
}
this.calculated_fields = [];
if (declaration.calculated_fields) {
for (const calc_field_name in declaration.calculated_fields) {
const calc_field_type_declaration =
declaration.calculated_fields[calc_field_name][0];
const calc_field_type_params =
declaration.calculated_fields[calc_field_name][1];
this.add_calculated_field(
calc_field_name,
calc_field_type_declaration,
calc_field_type_params
);
}
}
this.set_access_strategy(declaration.access_strategy);
}
};
Collection.type_name = "collection";
Collection.pure = {
add_field: function(
app,
field_type,
fields,
field_declaration,
collection
) {
const field_object = new Field(
app,
field_declaration,
field_type,
collection
);
const field_name = field_object.name;
if (!fields[field_name]) {
fields[field_name] = field_object;
} else {
throw new Errors.DeveloperError(
`Duplicate field names: "${field_name}" in collection: "${
field_type.name
}"`
);
}
},
add_fields: function(app, field_type, fields, field_declarations_array) {
for (const i in field_declarations_array) {
const declaration = field_declarations_array[i];
Collection.pure.add_field(app, field_type, fields, declaration);
}
},
add_calculated_field: function(
app,
collection,
calc_field_name,
calc_field_type_declaration,
calc_field_type_params
) {
collection.calculated_fields[calc_field_name] = new CalculatedField(
app,
calc_field_name,
calc_field_type_declaration,
calc_field_type_params
);
},
add_special_filters(Collection, named_filters) {
Collection.named_filters = named_filters;
},
get_unknown_field_errors: function(field_type_name, fields, values) {
const validation_errors = {};
for (const field_name in values) {
if (fields[field_name] === undefined) {
validation_errors[field_name] = new Errors.ValidationError(
`Unknown field '${field_name}' for resource-type '${field_type_name}'`
);
}
}
return validation_errors;
},
get_missing_values_checker: function(
fields,
values,
assume_delete_value_on_missing_key,
old_values
) {
if (assume_delete_value_on_missing_key) {
return function(field_name) {
return (
fields[field_name].required &&
values[field_name] === undefined
);
};
} else {
return function(field_name) {
return (
fields[field_name].required &&
values[field_name] === undefined &&
old_values[field_name] === undefined
);
};
}
},
get_missing_field_values_errors: function(
fields,
values,
assume_delete_value_on_missing_key,
old_values
) {
const errors = {};
const checker_fn = Collection.pure.get_missing_values_checker(
fields,
values,
assume_delete_value_on_missing_key,
old_values
);
return Promise.filter(Object.keys(fields), checker_fn)
.each(function(field_name) {
errors[field_name] = new Errors.ValidationError(
`Missing value for field '${field_name}'`
);
})
.then(function() {
return errors;
});
},
get_invalid_field_values_errors: function(
fields,
context,
values,
old_values
) {
const errors = {};
const promises = [];
for (const field_name in values) {
if (fields[field_name]) {
const value = values[field_name];
if (value === "") continue;
const old_value = old_values
? old_values[field_name]
: undefined;
const promise = fields[field_name]
.is_proper_value(context, value, old_value)
.catch(function(error) {
if (
typeof error === "string" ||
error.type === "validation"
) {
errors[field_name] = new Errors.ValidationError(
error
);
} else {
throw error;
}
});
promises.push(promise);
}
}
return Promise.all(promises).then(function() {
return errors;
});
},
get_missing_required_field_values: function(fields, new_values) {
const errors = {};
for (const field_name in new_values) {
if (
fields[field_name] &&
fields[field_name].required &&
new_values[field_name] === ""
) {
errors[field_name] = new Errors.ValidationError(
`Missing value for required field: '${field_name}'`
);
}
}
return errors;
},
validate_field_values: function(
field_type_name,
fields,
context,
assume_delete_value_on_missing_key,
new_values,
old_values
) {
const errors_array = [
Collection.pure.get_missing_required_field_values(
fields,
new_values
),
Collection.pure.get_unknown_field_errors(
field_type_name,
fields,
new_values
),
Collection.pure.get_missing_field_values_errors(
fields,
new_values,
assume_delete_value_on_missing_key,
old_values
),
Collection.pure.get_invalid_field_values_errors(
fields,
context,
new_values,
old_values
),
];
return Promise.all(errors_array)
.reduce(merge)
.then(function(errors) {
const user_errors = {};
const non_user_errors = {};
for (const field_name in errors) {
const error = errors[field_name];
if (error.is_user_fault) {
user_errors[field_name] = error;
} else {
non_user_errors[field_name] = error;
}
}
const non_user_errors_amount = Object.keys(non_user_errors)
.length;
if (non_user_errors_amount > 0) {
throw non_user_errors[Object.keys(non_user_errors)[0]];
}
const user_errors_amount = Object.keys(user_errors).length;
if (user_errors_amount > 0) {
throw new Errors.ValidationError(
"There are problems with some of the provided values.",
user_errors
);
}
});
},
encode_field_values: async function(fields, context, body, old_body) {
const promises = {};
for (let field_name in fields) {
const field = fields[field_name];
const type = field.type;
if (
!body[field_name] &&
type.get_default_value &&
(!old_body || old_body[field_name] === undefined)
) {
body[field_name] = await type.get_default_value();
}
}
for (const field_name in body) {
const current_value = body[field_name];
if (current_value === undefined || current_value === "") {
promises[field_name] = "";
} else {
const old_value = old_body && old_body[field_name];
promises[field_name] = fields[field_name].encode(
context,
current_value,
old_value
);
}
}
return Promise.props(promises);
},
get_specification: function(
name,
human_readable_name,
summary,
fields,
with_validators
) {
// with_validators:boolean - whether to include validator functions in field descriptions. Warning! If set to true, the output is not serializable in JSON.
const collection_specification = {};
for (const field_name in fields) {
const field_specification = fields[field_name].get_specification(
with_validators
);
collection_specification[field_name] = field_specification;
collection_specification[field_name].required =
fields[field_name].required;
}
const specification = {
name: name,
human_readable_name: human_readable_name,
summary: summary,
fields: collection_specification,
display_hints: this.display_hints,
};
return specification;
},
set_access_strategy: function(app, collection, strategy_declaration) {
if (
typeof strategy_declaration === "string" ||
strategy_declaration instanceof AccessStrategyType ||
strategy_declaration instanceof Array
) {
collection.access_strategy = {
default: new AccessStrategy(strategy_declaration),
};
} else if (typeof strategy_declaration === "object") {
for (const action_name in strategy_declaration) {
const access_strategy = strategy_declaration[action_name];
collection.access_strategy[action_name] = new AccessStrategy(
app,
access_strategy
);
}
}
},
get_access_strategy: function(access_strategy_map, action_name) {
const ret =
access_strategy_map[action_name] || access_strategy_map["default"];
return ret;
},
has_large_data_fields: function(fields) {
for (const i in fields) {
const field = fields[i];
if (field.type.handles_large_data) {
return true;
}
}
return false;
},
is_old_value_sensitive: function(fields, action_name) {
for (const i in fields) {
if (fields[i].type.is_old_value_sensitive(action_name)) {
return true;
}
}
return false;
},
decode_values: function(fields, context, values) {
const decoded_values = {};
for (const key in fields) {
const value = values[key];
const field = fields[key];
if (field === undefined) {
continue;
}
decoded_values[key] = field.decode(context, value);
}
return Promise.props(decoded_values);
},
format_decoded_values: function(fields, context, decoded_values, format) {
const formatted_values = clone(decoded_values);
for (const field_name in formatted_values) {
const field_format = format[field_name] || undefined;
const decoded_value = decoded_values[field_name];
formatted_values[field_name] = fields[field_name].format(
context,
decoded_value,
field_format
);
}
return Promise.props(formatted_values);
},
_get_body: async function(fields, context, db_document, format) {
const decoded_values = await Collection.pure.decode_values(
fields,
context,
db_document
);
return Collection.pure.format_decoded_values(
fields,
context,
decoded_values,
format || {}
);
},
_get_calculated_fields: function(
context,
calculated_fields,
representation,
raw_db_entry,
calculate
) {
const ret = {};
for (const field_name in calculated_fields) {
if (calculate === true || calculate[field_name]) {
ret[field_name] = calculated_fields[field_name].get_value(
context,
representation,
raw_db_entry
);
}
}
return Promise.props(ret);
},
get_resource_representation: async function(
fields,
field_type_name,
context,
db_document,
format,
calculated_fields,
calculate
) {
if (calculate === undefined) calculate = true;
const representation = await Collection.pure._get_body(
fields,
context,
db_document,
format
);
representation.id = db_document.sealious_id;
representation._metadata = db_document._metadata;
representation._metadata.collection_name = field_type_name;
if (calculate) {
representation.calculated_fields = await Collection.pure._get_calculated_fields(
context,
calculated_fields,
representation,
db_document,
calculate
);
}
return representation;
},
check_if_action_is_allowed: function(
access_strategy_map,
context,
action_name,
item
) {
const access_strategy = Collection.pure.get_access_strategy(
access_strategy_map,
action_name
);
const sealious_response = item
? new SingleItemResponse({ item })
: undefined;
return access_strategy.check(context, sealious_response);
},
get_aggregation_stages: function(
collection,
context,
action_name,
query_params,
named_filters,
ids
) {
const fields = collection.fields;
const access_strategy_map = collection.access_strategy;
const access_strategy = Collection.pure.get_access_strategy(
access_strategy_map,
action_name
);
return Promise.all([
query_params.search
? [
{
$match: {
$text: {
$search: query_params.search.toString(),
$caseSensitive: false,
$diacriticSensitive: false,
},
},
},
]
: [],
access_strategy
.getRestrictingQuery(context)
.then(query => query.toPipeline()),
Promise.all(
Object.keys(fields).map(field_name =>
fields[field_name].get_aggregation_stages(
context,
query_params
)
)
).then(array =>
array.sort((a, b) => {
return Object.keys(a[0] || {})[0] === "$match" ? -1 : 1;
})
),
Promise.map(named_filters, async named_filter =>
(await collection.named_filters[named_filter].getFilteringQuery(
collection
)).toPipeline()
),
Promise.resolve(
ids.length === 0
? []
: collection.app.Query.fromSingleMatch({
sealious_id: { $in: ids },
}).toPipeline()
),
])
.map(Promise.all)
.reduce((a, b) => a.concat(b), [])
.reduce((a, b) => a.concat(b), []);
},
};
const pure = Collection.pure;
// not all pure methods are linked here, because they are not intended to be called from outside
Collection.prototype = {
add_field(field_declaration) {
return pure.add_field(
this.app,
this,
this.fields,
field_declaration,
this
);
},
add_fields(field_declarations_array) {
return pure.add_fields(
this.app,
this,
this.fields,
field_declarations_array
);
},
add_calculated_field(calc_field_name, type_declaration, type_params) {
return pure.add_calculated_field(
this.app,
this,
calc_field_name,
type_declaration,
type_params
);
},
add_special_filters: function(named_filters = []) {
return pure.add_special_filters(this, named_filters);
},
get_named_filter: function(filter_name) {
return this.named_filters[filter_name];
},
add_named_filter: function(filter_name, filter) {
this.named_filters[filter_name] = filter;
},
validate_field_values(
context,
assume_delete_value_on_missing_key,
new_values,
old_values
) {
return pure.validate_field_values(
this.name,
this.fields,
context,
assume_delete_value_on_missing_key,
new_values,
old_values
);
},
encode_field_values(context, body, old_body) {
return pure.encode_field_values(this.fields, context, body, old_body);
},
get_specification(with_validators) {
return pure.get_specification(
this.name,
this.human_readable_name,
this.summary,
this.fields,
with_validators
);
},
set_access_strategy(strategy_declaration) {
return pure.set_access_strategy(this.app, this, strategy_declaration);
},
get_access_strategy(action_name) {
return pure.get_access_strategy(this.access_strategy, action_name);
},
has_large_data_fields() {
return pure.has_large_data_fields(this.fields);
},
is_old_value_sensitive(action_name) {
return pure.is_old_value_sensitive(this.fields, action_name);
},
decoded_values(context, values) {
return pure.decode_values(this.fields, context, values);
},
format_decoded_values(context, decoded_values, format) {
return pure.format_decoded_values(
this.fields,
context,
decoded_values,
format
);
},
get_resource_representation(context, db_document, format, calculate) {
return pure.get_resource_representation(
this.fields,
this.name,
context,
db_document,
format,
this.calculated_fields,
calculate
);
},
check_if_action_is_allowed(context, action_name, resource_representation) {
return pure.check_if_action_is_allowed(
this.access_strategy,
context,
action_name,
resource_representation
);
},
get_aggregation_stages(
context,
action_name,
query_params,
named_filters = [],
ids = []
) {
return pure.get_aggregation_stages(
this,
context,
action_name,
query_params,
named_filters,
ids
);
},
};
Collection.prototype.decode_db_entry =
Collection.prototype.get_resource_representation;
module.exports = Collection;

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