@aws-cdk/cloudformation-diff
Version:
Utilities to diff CDK stacks against CloudFormation templates
497 lines • 71.5 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.ResourceDifference = exports.ResourceImpact = exports.ParameterDifference = exports.OutputDifference = exports.MetadataDifference = exports.MappingDifference = exports.ConditionDifference = exports.DifferenceCollection = exports.PropertyDifference = exports.Difference = exports.TemplateDiff = void 0;
exports.isPropertyDifference = isPropertyDifference;
const assert_1 = require("assert");
const service_spec_types_1 = require("@aws-cdk/service-spec-types");
const util_1 = require("./util");
const iam_changes_1 = require("../iam/iam-changes");
const security_group_changes_1 = require("../network/security-group-changes");
/** Semantic differences between two CloudFormation templates. */
class TemplateDiff {
constructor(args) {
if (args.awsTemplateFormatVersion !== undefined) {
this.awsTemplateFormatVersion = args.awsTemplateFormatVersion;
}
if (args.description !== undefined) {
this.description = args.description;
}
if (args.transform !== undefined) {
this.transform = args.transform;
}
this.conditions = args.conditions || new DifferenceCollection({});
this.mappings = args.mappings || new DifferenceCollection({});
this.metadata = args.metadata || new DifferenceCollection({});
this.outputs = args.outputs || new DifferenceCollection({});
this.parameters = args.parameters || new DifferenceCollection({});
this.resources = args.resources || new DifferenceCollection({});
this.unknown = args.unknown || new DifferenceCollection({});
this.iamChanges = new iam_changes_1.IamChanges({
propertyChanges: this.scrutinizablePropertyChanges(iam_changes_1.IamChanges.IamPropertyScrutinies),
resourceChanges: this.scrutinizableResourceChanges(iam_changes_1.IamChanges.IamResourceScrutinies),
});
this.securityGroupChanges = new security_group_changes_1.SecurityGroupChanges({
egressRulePropertyChanges: this.scrutinizablePropertyChanges([service_spec_types_1.PropertyScrutinyType.EgressRules]),
ingressRulePropertyChanges: this.scrutinizablePropertyChanges([service_spec_types_1.PropertyScrutinyType.IngressRules]),
egressRuleResourceChanges: this.scrutinizableResourceChanges([service_spec_types_1.ResourceScrutinyType.EgressRuleResource]),
ingressRuleResourceChanges: this.scrutinizableResourceChanges([service_spec_types_1.ResourceScrutinyType.IngressRuleResource]),
});
}
get differenceCount() {
let count = 0;
if (this.awsTemplateFormatVersion !== undefined) {
count += 1;
}
if (this.description !== undefined) {
count += 1;
}
if (this.transform !== undefined) {
count += 1;
}
count += this.conditions.differenceCount;
count += this.mappings.differenceCount;
count += this.metadata.differenceCount;
count += this.outputs.differenceCount;
count += this.parameters.differenceCount;
count += this.resources.differenceCount;
count += this.unknown.differenceCount;
return count;
}
get isEmpty() {
return this.differenceCount === 0;
}
/**
* Return true if any of the permissions objects involve a broadening of permissions
*/
get permissionsBroadened() {
return this.iamChanges.permissionsBroadened || this.securityGroupChanges.rulesAdded;
}
/**
* Return true if any of the permissions objects have changed
*/
get permissionsAnyChanges() {
return this.iamChanges.hasChanges || this.securityGroupChanges.hasChanges;
}
/**
* Return all property changes of a given scrutiny type
*
* We don't just look at property updates; we also look at resource additions and deletions (in which
* case there is no further detail on property values), and resource type changes.
*/
scrutinizablePropertyChanges(scrutinyTypes) {
const ret = new Array();
for (const [resourceLogicalId, resourceChange] of Object.entries(this.resources.changes)) {
if (resourceChange.resourceTypeChanged) {
// we ignore resource type changes here, and handle them in scrutinizableResourceChanges()
continue;
}
if (!resourceChange.resourceType) {
// We use resourceChange.resourceType to loadResourceModel so that we can inspect the
// properties of a resource even after the resource is removed from the template.
continue;
}
const newTypeProps = (0, util_1.loadResourceModel)(resourceChange.resourceType)?.properties || {};
for (const [propertyName, prop] of Object.entries(newTypeProps)) {
const propScrutinyType = prop.scrutinizable || service_spec_types_1.PropertyScrutinyType.None;
if (scrutinyTypes.includes(propScrutinyType)) {
ret.push({
resourceLogicalId,
propertyName,
resourceType: resourceChange.resourceType,
scrutinyType: propScrutinyType,
oldValue: resourceChange.oldProperties?.[propertyName],
newValue: resourceChange.newProperties?.[propertyName],
});
}
}
}
return ret;
}
/**
* Return all resource changes of a given scrutiny type
*
* We don't just look at resource updates; we also look at resource additions and deletions (in which
* case there is no further detail on property values), and resource type changes.
*/
scrutinizableResourceChanges(scrutinyTypes) {
const ret = new Array();
for (const [resourceLogicalId, resourceChange] of Object.entries(this.resources.changes)) {
if (!resourceChange) {
continue;
}
const commonProps = {
oldProperties: resourceChange.oldProperties,
newProperties: resourceChange.newProperties,
resourceLogicalId,
};
// changes to the Type of resources can happen when migrating from CFN templates that use Transforms
if (resourceChange.resourceTypeChanged) {
// Treat as DELETE+ADD
if (resourceChange.oldResourceType) {
const oldResourceModel = (0, util_1.loadResourceModel)(resourceChange.oldResourceType);
if (oldResourceModel && this.resourceIsScrutinizable(oldResourceModel, scrutinyTypes)) {
ret.push({
...commonProps,
newProperties: undefined,
resourceType: resourceChange.oldResourceType,
scrutinyType: oldResourceModel.scrutinizable,
});
}
}
if (resourceChange.newResourceType) {
const newResourceModel = (0, util_1.loadResourceModel)(resourceChange.newResourceType);
if (newResourceModel && this.resourceIsScrutinizable(newResourceModel, scrutinyTypes)) {
ret.push({
...commonProps,
oldProperties: undefined,
resourceType: resourceChange.newResourceType,
scrutinyType: newResourceModel.scrutinizable,
});
}
}
}
else {
if (!resourceChange.resourceType) {
continue;
}
const resourceModel = (0, util_1.loadResourceModel)(resourceChange.resourceType);
if (resourceModel && this.resourceIsScrutinizable(resourceModel, scrutinyTypes)) {
ret.push({
...commonProps,
resourceType: resourceChange.resourceType,
scrutinyType: resourceModel.scrutinizable,
});
}
}
}
return ret;
}
resourceIsScrutinizable(res, scrutinyTypes) {
return scrutinyTypes.includes(res.scrutinizable || service_spec_types_1.ResourceScrutinyType.None);
}
}
exports.TemplateDiff = TemplateDiff;
/**
* Models an entity that changed between two versions of a CloudFormation template.
*/
class Difference {
/**
* @param oldValue - the old value, cannot be equal (to the sense of +deepEqual+) to +newValue+.
* @param newValue - the new value, cannot be equal (to the sense of +deepEqual+) to +oldValue+.
*/
constructor(oldValue, newValue) {
this.oldValue = oldValue;
this.newValue = newValue;
if (oldValue === undefined && newValue === undefined) {
throw new assert_1.AssertionError({ message: 'oldValue and newValue are both undefined!' });
}
this.isDifferent = !(0, util_1.deepEqual)(oldValue, newValue);
}
/** @returns +true+ if the element is new to the template. */
get isAddition() {
return this.oldValue === undefined;
}
/** @returns +true+ if the element was removed from the template. */
get isRemoval() {
return this.newValue === undefined;
}
/** @returns +true+ if the element was already in the template and is updated. */
get isUpdate() {
return this.oldValue !== undefined
&& this.newValue !== undefined;
}
}
exports.Difference = Difference;
class PropertyDifference extends Difference {
constructor(oldValue, newValue, args) {
super(oldValue, newValue);
this.changeImpact = args.changeImpact;
}
}
exports.PropertyDifference = PropertyDifference;
class DifferenceCollection {
constructor(diffs) {
this.diffs = diffs;
}
get changes() {
return onlyChanges(this.diffs);
}
get differenceCount() {
return Object.values(this.changes).length;
}
get(logicalId) {
const ret = this.diffs[logicalId];
if (!ret) {
throw new Error(`No object with logical ID '${logicalId}'`);
}
return ret;
}
remove(logicalId) {
delete this.diffs[logicalId];
}
get logicalIds() {
return Object.keys(this.changes);
}
/**
* Returns a new TemplateDiff which only contains changes for which `predicate`
* returns `true`.
*/
filter(predicate) {
const newChanges = {};
for (const id of Object.keys(this.changes)) {
const diff = this.changes[id];
if (predicate(diff)) {
newChanges[id] = diff;
}
}
return new DifferenceCollection(newChanges);
}
/**
* Invokes `cb` for all changes in this collection.
*
* Changes will be sorted as follows:
* - Removed
* - Added
* - Updated
* - Others
*
*/
forEachDifference(cb) {
const removed = new Array();
const added = new Array();
const updated = new Array();
const others = new Array();
for (const logicalId of this.logicalIds) {
const change = this.changes[logicalId];
if (change.isAddition) {
added.push({ logicalId, change });
}
else if (change.isRemoval) {
removed.push({ logicalId, change });
}
else if (change.isUpdate) {
updated.push({ logicalId, change });
}
else if (change.isDifferent) {
others.push({ logicalId, change });
}
}
removed.forEach(v => cb(v.logicalId, v.change));
added.forEach(v => cb(v.logicalId, v.change));
updated.forEach(v => cb(v.logicalId, v.change));
others.forEach(v => cb(v.logicalId, v.change));
}
}
exports.DifferenceCollection = DifferenceCollection;
class ConditionDifference extends Difference {
}
exports.ConditionDifference = ConditionDifference;
class MappingDifference extends Difference {
}
exports.MappingDifference = MappingDifference;
class MetadataDifference extends Difference {
}
exports.MetadataDifference = MetadataDifference;
class OutputDifference extends Difference {
}
exports.OutputDifference = OutputDifference;
class ParameterDifference extends Difference {
}
exports.ParameterDifference = ParameterDifference;
var ResourceImpact;
(function (ResourceImpact) {
/** The existing physical resource will be updated */
ResourceImpact["WILL_UPDATE"] = "WILL_UPDATE";
/** A new physical resource will be created */
ResourceImpact["WILL_CREATE"] = "WILL_CREATE";
/** The existing physical resource will be replaced */
ResourceImpact["WILL_REPLACE"] = "WILL_REPLACE";
/** The existing physical resource may be replaced */
ResourceImpact["MAY_REPLACE"] = "MAY_REPLACE";
/** The existing physical resource will be destroyed */
ResourceImpact["WILL_DESTROY"] = "WILL_DESTROY";
/** The existing physical resource will be removed from CloudFormation supervision */
ResourceImpact["WILL_ORPHAN"] = "WILL_ORPHAN";
/** The existing physical resource will be added to CloudFormation supervision */
ResourceImpact["WILL_IMPORT"] = "WILL_IMPORT";
/** There is no change in this resource */
ResourceImpact["NO_CHANGE"] = "NO_CHANGE";
})(ResourceImpact || (exports.ResourceImpact = ResourceImpact = {}));
/**
* This function can be used as a reducer to obtain the resource-level impact of a list
* of property-level impacts.
* @param one - the current worst impact so far.
* @param two - the new impact being considered (can be undefined, as we may not always be
* able to determine some properties impact).
*/
function worstImpact(one, two) {
if (!two) {
return one;
}
const badness = {
[ResourceImpact.NO_CHANGE]: 0,
[ResourceImpact.WILL_IMPORT]: 0,
[ResourceImpact.WILL_UPDATE]: 1,
[ResourceImpact.WILL_CREATE]: 2,
[ResourceImpact.WILL_ORPHAN]: 3,
[ResourceImpact.MAY_REPLACE]: 4,
[ResourceImpact.WILL_REPLACE]: 5,
[ResourceImpact.WILL_DESTROY]: 6,
};
return badness[one] > badness[two] ? one : two;
}
/**
* Change to a single resource between two CloudFormation templates
*
* This class can be mutated after construction.
*/
class ResourceDifference {
constructor(oldValue, newValue, args) {
this.oldValue = oldValue;
this.newValue = newValue;
this.resourceTypes = args.resourceType;
this.propertyDiffs = args.propertyDiffs;
this.otherDiffs = args.otherDiffs;
this.isAddition = oldValue === undefined;
this.isRemoval = newValue === undefined;
this.isImport = undefined;
}
get oldProperties() {
return this.oldValue && this.oldValue.Properties;
}
get newProperties() {
return this.newValue && this.newValue.Properties;
}
/**
* Whether this resource was modified at all
*/
get isDifferent() {
return this.differenceCount > 0 || this.oldResourceType !== this.newResourceType;
}
/**
* Whether the resource was updated in-place
*/
get isUpdate() {
return this.isDifferent && !this.isAddition && !this.isRemoval;
}
get oldResourceType() {
return this.resourceTypes.oldType;
}
get newResourceType() {
return this.resourceTypes.newType;
}
/**
* All actual property updates
*/
get propertyUpdates() {
return onlyChanges(this.propertyDiffs);
}
/**
* All actual "other" updates
*/
get otherChanges() {
return onlyChanges(this.otherDiffs);
}
/**
* Return whether the resource type was changed in this diff
*
* This is not a valid operation in CloudFormation but to be defensive we're going
* to be aware of it anyway.
*/
get resourceTypeChanged() {
return (this.resourceTypes.oldType !== undefined
&& this.resourceTypes.newType !== undefined
&& this.resourceTypes.oldType !== this.resourceTypes.newType);
}
/**
* Return the resource type if it was unchanged
*
* If the resource type was changed, it's an error to call this.
*/
get resourceType() {
if (this.resourceTypeChanged) {
throw new Error('Cannot get .resourceType, because the type was changed');
}
return this.resourceTypes.oldType || this.resourceTypes.newType;
}
/**
* Replace a PropertyChange in this object
*
* This affects the property diff as it is summarized to users, but it DOES
* NOT affect either the "oldValue" or "newValue" values; those still contain
* the actual template values as provided by the user (they might still be
* used for downstream processing).
*/
setPropertyChange(propertyName, change) {
this.propertyDiffs[propertyName] = change;
}
/**
* Replace a OtherChange in this object
*
* This affects the property diff as it is summarized to users, but it DOES
* NOT affect either the "oldValue" or "newValue" values; those still contain
* the actual template values as provided by the user (they might still be
* used for downstream processing).
*/
setOtherChange(otherName, change) {
this.otherDiffs[otherName] = change;
}
get changeImpact() {
if (this.isImport) {
return ResourceImpact.WILL_IMPORT;
}
// Check the Type first
if (this.resourceTypes.oldType !== this.resourceTypes.newType) {
if (this.resourceTypes.oldType === undefined) {
return ResourceImpact.WILL_CREATE;
}
if (this.resourceTypes.newType === undefined) {
return this.oldValue.DeletionPolicy === 'Retain'
? ResourceImpact.WILL_ORPHAN
: ResourceImpact.WILL_DESTROY;
}
return ResourceImpact.WILL_REPLACE;
}
// Base impact (before we mix in the worst of the property impacts);
// WILL_UPDATE if we have "other" changes, NO_CHANGE if there are no "other" changes.
const baseImpact = Object.keys(this.otherChanges).length > 0 ? ResourceImpact.WILL_UPDATE : ResourceImpact.NO_CHANGE;
return Object.values(this.propertyDiffs)
.map(elt => elt.changeImpact)
.reduce(worstImpact, baseImpact);
}
/**
* Count of actual differences (not of elements)
*/
get differenceCount() {
return Object.values(this.propertyUpdates).length
+ Object.values(this.otherChanges).length;
}
/**
* Invoke a callback for each actual difference
*/
forEachDifference(cb) {
for (const key of Object.keys(this.propertyUpdates).sort()) {
cb('Property', key, this.propertyUpdates[key]);
}
for (const key of Object.keys(this.otherChanges).sort()) {
cb('Other', key, this.otherDiffs[key]);
}
}
}
exports.ResourceDifference = ResourceDifference;
function isPropertyDifference(diff) {
return diff.changeImpact !== undefined;
}
/**
* Filter a map of IDifferences down to only retain the actual changes
*/
function onlyChanges(xs) {
const ret = {};
for (const [key, diff] of Object.entries(xs)) {
if (diff.isDifferent) {
ret[key] = diff;
}
}
return ret;
}
//# 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This is the part of the CloudFormation template\n * that defines what the resource is before the change is applied; that is, BeforeContext is CloudFormationTemplate.Resources[LogicalId] before the ChangeSet is executed.\n *\n * @param afterContext - same as beforeContext but for after the change is made; that is, AfterContext is CloudFormationTemplate.Resources[LogicalId] after the ChangeSet is executed.\n *\n *  * Here is an example of what a beforeContext/afterContext looks like:\n *  '{\"Properties\":{\"Value\":\"sdflkja\",\"Type\":\"String\",\"Name\":\"mySsmParameterFromStack\"},\"Metadata\":{\"aws:cdk:path\":\"cdk/mySsmParameter/Resource\"}}'\n */\nexport interface ChangeSetResource {\n  resourceWasReplaced: boolean;\n  resourceType: string | undefined;\n  propertyReplacementModes: PropertyReplacementModeMap | undefined;\n}\n\nexport type PropertyReplacementModeMap = {\n  [propertyName: string]: {\n    replacementMode: ReplacementModes | undefined;\n  };\n};\n\n/**\n * 'Always' means that changing the corresponding property will always cause a resource replacement. Never means never. 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we also look at resource additions and deletions (in which\n   * case there is no further detail on property values), and resource type changes.\n   */\n  private scrutinizablePropertyChanges(scrutinyTypes: PropertyScrutinyType[]): PropertyChange[] {\n    const ret = new Array<PropertyChange>();\n\n    for (const [resourceLogicalId, resourceChange] of Object.entries(this.resources.changes)) {\n      if (resourceChange.resourceTypeChanged) {\n        // we ignore resource type changes here, and handle them in scrutinizableResourceChanges()\n        continue;\n      }\n\n      if (!resourceChange.resourceType) {\n        // We use resourceChange.resourceType to loadResourceModel so that we can inspect the\n        // properties of a resource even after the resource is removed from the template.\n        continue;\n      }\n\n      const newTypeProps = loadResourceModel(resourceChange.resourceType)?.properties || {};\n      for (const [propertyName, prop] of Object.entries(newTypeProps)) {\n        const propScrutinyType = prop.scrutinizable || PropertyScrutinyType.None;\n        if (scrutinyTypes.includes(propScrutinyType)) {\n          ret.push({\n            resourceLogicalId,\n            propertyName,\n            resourceType: resourceChange.resourceType,\n            scrutinyType: propScrutinyType,\n            oldValue: resourceChange.oldProperties?.[propertyName],\n            newValue: resourceChange.newProperties?.[propertyName],\n          });\n        }\n      }\n    }\n\n    return ret;\n  }\n\n  /**\n   * Return all resource changes of a given scrutiny type\n   *\n   * We don't just look at resource updates; 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