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database.go
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database.go
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/*
Copyright (C) 2017 Jorge Martinez Hernandez
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// Package database provides wrapper functions that create and modify objects based on models in an SQL database.
// See the models package for more information on the types of objects database operates on.
package database
import (
"crypto/rand"
"io"
"time"
"github.com/jinzhu/gorm"
// GORM dialect packages
"github.com/dgrijalva/jwt-go"
_ "github.com/jinzhu/gorm/dialects/mysql"
_ "github.com/jinzhu/gorm/dialects/postgres"
_ "github.com/jinzhu/gorm/dialects/sqlite"
uuid "github.com/satori/go.uuid"
"golang.org/x/crypto/scrypt"
"github.com/chavamee/syndication/models"
)
// Password salt and Hash byte sizes
const (
PWSaltBytes = 32
PWHashBytes = 64
)
// DB represents a connectin to a SQL database
type DB struct {
db *gorm.DB
Connection string
Type string
}
// NewDB creates a new DB instance
func NewDB(dbType, conn string) (db *DB, err error) {
gormDB, err := gorm.Open(dbType, conn)
if err != nil {
return
}
db = &DB{
Connection: conn,
Type: dbType,
}
gormDB.AutoMigrate(&models.Feed{})
gormDB.AutoMigrate(&models.Category{})
gormDB.AutoMigrate(&models.User{})
gormDB.AutoMigrate(&models.Entry{})
gormDB.AutoMigrate(&models.Tag{})
gormDB.AutoMigrate(&models.APIKey{})
db.db = gormDB
return
}
// Close ends connections with the database
func (db *DB) Close() error {
return db.db.Close()
}
func createPasswordHashAndSalt(password string) (hash []byte, salt []byte, err error) {
salt = make([]byte, PWSaltBytes)
_, err = io.ReadFull(rand.Reader, salt)
if err != nil {
return
}
hash, err = scrypt.Key([]byte(password), salt, 1<<14, 8, 1, PWHashBytes)
if err != nil {
return
}
return
}
// NewUser creates a new User object
func (db *DB) NewUser(username, password string) error {
user := &models.User{}
if !db.db.Where("username = ?", username).First(user).RecordNotFound() {
return Conflict{"User already exists"}
}
hash, salt, err := createPasswordHashAndSalt(password)
if err != nil {
return err
}
// Construct the user system categories
unctgUUID := uuid.NewV4().String()
user.Categories = append(user.Categories, models.Category{
UUID: unctgUUID,
Name: models.Uncategorized,
})
user.UncategorizedCategoryUUID = unctgUUID
savedUUID := uuid.NewV4().String()
user.Categories = append(user.Categories, models.Category{
UUID: savedUUID,
Name: "Saved",
})
user.SavedCategoryUUID = savedUUID
user.UUID = uuid.NewV4().String()
user.PasswordHash = hash
user.PasswordSalt = salt
user.Username = username
db.db.Create(&user).Related(&user.Categories)
return nil
}
// DeleteUser deletes a User object
func (db *DB) DeleteUser(userID string) error {
user := &models.User{}
if db.db.Where("uuid = ?", userID).First(user).RecordNotFound() {
return BadRequest{"User does not exists"}
}
db.db.Delete(user)
return nil
}
// ChangeUserName for user with userID
func (db *DB) ChangeUserName(userID, newName string) error {
user := &models.User{}
if db.db.Where("uuid = ?", userID).First(user).RecordNotFound() {
return BadRequest{"User does not exists"}
}
db.db.Model(user).Update("username", newName)
return nil
}
// ChangeUserPassword for user with userID
func (db *DB) ChangeUserPassword(userID, newPassword string) error {
user := &models.User{}
if db.db.Where("uuid = ?", userID).First(user).RecordNotFound() {
return BadRequest{"User does not exists"}
}
hash, salt, err := createPasswordHashAndSalt(newPassword)
if err != nil {
return err
}
db.db.Model(user).Update(models.User{
PasswordHash: hash,
PasswordSalt: salt,
})
return nil
}
// Users returns a list of all User entries.
// The parameter fields provides a way to select
// which fields are populated in the returned models.
func (db *DB) Users(fields ...string) (users []models.User) {
selectFields := "id,uuid"
if len(fields) != 0 {
for _, field := range fields {
selectFields = selectFields + "," + field
}
}
db.db.Select(selectFields).Find(&users)
return
}
// UserPrimaryKey returns the SQL primary key of a User with a uuid
func (db *DB) UserPrimaryKey(uuid string) (uint, error) {
user := &models.User{}
if db.db.First(user, "uuid = ?", uuid).RecordNotFound() {
return 0, NotFound{"User does not exist"}
}
return user.ID, nil
}
// UserWithName returns a User with username
func (db *DB) UserWithName(username string) (user models.User, err error) {
if db.db.First(&user, "username = ?", username).RecordNotFound() {
err = NotFound{"User does not exist"}
}
return
}
// UserWithUUID returns a User with id
func (db *DB) UserWithUUID(uuid string) (user models.User, err error) {
if db.db.First(&user, "UUID = ?", uuid).RecordNotFound() {
err = NotFound{"User does not exist"}
}
return
}
// Authenticate a user and return its respective User model if successful
func (db *DB) Authenticate(username, password string) (user models.User, err error) {
user, err = db.UserWithName(username)
if err != nil {
return
}
hash, err := scrypt.Key([]byte(password), user.PasswordSalt, 1<<14, 8, 1, PWHashBytes)
if err != nil {
return
}
for i, hashByte := range hash {
if hashByte != user.PasswordHash[i] {
err = Unauthorized{"Invalid credentials"}
}
}
return
}
// NewAPIKey creates a new APIKey object owned by user
func (db *DB) NewAPIKey(secret string, user *models.User) (models.APIKey, error) {
token := jwt.New(jwt.SigningMethodHS256)
claims := token.Claims.(jwt.MapClaims)
claims["id"] = user.UUID
claims["admin"] = false
claims["exp"] = time.Now().Add(time.Hour * 72).Unix()
t, err := token.SignedString([]byte(secret))
if err != nil {
return models.APIKey{}, err
}
key := &models.APIKey{
Key: t,
User: *user,
UserID: user.ID,
}
db.db.Model(user).Association("APIKeys").Append(key)
return *key, nil
}
// KeyBelongsToUser returns true if the given APIKey is owned by user
func (db *DB) KeyBelongsToUser(key *models.APIKey, user *models.User) (bool, error) {
if key.Key == "" {
return false, BadRequest{"No key provided"}
}
found := !db.db.Model(user).Where("key = ?", key.Key).Related(&models.APIKey{}).RecordNotFound()
return found, nil
}
// NewFeed creates a new Feed object owned by user
func (db *DB) NewFeed(feed *models.Feed, user *models.User) error {
feed.UUID = uuid.NewV4().String()
var err error
var ctg models.Category
if feed.Category.UUID != "" {
ctg, err = db.Category(feed.Category.UUID, user)
if err != nil {
return BadRequest{"Feed has invalid category"}
}
} else {
db.db.Model(user).Where("name = ?", models.Uncategorized).Related(&ctg)
}
feed.Category = ctg
feed.CategoryID = ctg.ID
feed.Category.UUID = ctg.UUID
db.db.Model(user).Association("Feeds").Append(feed)
db.db.Model(&ctg).Association("Feeds").Append(feed)
return nil
}
// Feeds returns a list of all Feeds owned by a user
func (db *DB) Feeds(user *models.User) (feeds []models.Feed) {
db.db.Model(user).Association("Feeds").Find(&feeds)
return
}
// FeedsFromCategory returns all Feeds that belong to a category with categoryID
func (db *DB) FeedsFromCategory(categoryID string, user *models.User) (feeds []models.Feed, err error) {
ctg, err := db.Category(categoryID, user)
if err != nil {
return
}
db.db.Model(ctg).Association("Feeds").Find(&feeds)
return
}
// Feed returns a Feed with id and owned by user
func (db *DB) Feed(id string, user *models.User) (feed models.Feed, err error) {
if db.db.Model(user).Where("uuid = ?", id).Related(&feed).RecordNotFound() {
err = NotFound{"Feed does not exist"}
return
}
db.db.Model(&feed).Related(&feed.Category)
return
}
// DeleteFeed with id and owned by user
func (db *DB) DeleteFeed(id string, user *models.User) error {
foundFeed := &models.Feed{}
if !db.db.Model(user).Where("uuid = ?", id).Related(foundFeed).RecordNotFound() {
db.db.Delete(foundFeed)
return nil
}
return NotFound{"Feed does not exist"}
}
// EditFeed owned by user
func (db *DB) EditFeed(feed *models.Feed, user *models.User) error {
foundFeed := &models.Feed{}
if !db.db.Model(user).Related(foundFeed, "uuid = ?", feed.UUID).RecordNotFound() {
foundFeed.Title = feed.Title
db.db.Model(feed).Save(foundFeed)
return nil
}
return NotFound{"Feed does not exist"}
}
// NewCategory creates a new Category object owned by user
func (db *DB) NewCategory(ctg *models.Category, user *models.User) error {
if ctg.Name == "" {
return BadRequest{"Category name should not be empty"}
}
tmpCtg := &models.Category{}
if db.db.Model(user).Where("name = ?", ctg.Name).Related(tmpCtg).RecordNotFound() {
ctg.UUID = uuid.NewV4().String()
db.db.Model(user).Association("Categories").Append(ctg)
return nil
}
return Conflict{"Category already exists"}
}
// EditCategory owned by user
func (db *DB) EditCategory(ctg *models.Category, user *models.User) error {
foundCtg := &models.Category{}
if !db.db.Model(user).Where("uuid = ?", ctg.UUID).Related(foundCtg).RecordNotFound() {
foundCtg.Name = ctg.Name
db.db.Model(ctg).Save(foundCtg)
return nil
}
return NotFound{"Category does not exist"}
}
// DeleteCategory with id and owned by user
func (db *DB) DeleteCategory(id string, user *models.User) error {
if id == user.UncategorizedCategoryUUID || id == user.SavedCategoryUUID {
return BadRequest{"Cannot delete system categories"}
}
ctg := &models.Category{}
if db.db.Model(user).Where("uuid = ?", id).Related(ctg).RecordNotFound() {
return NotFound{"Category does not exist"}
}
db.db.Delete(ctg)
return nil
}
// Category returns a Category with id and owned by user
func (db *DB) Category(id string, user *models.User) (ctg models.Category, err error) {
if db.db.Model(user).Where("uuid = ?", id).Related(&ctg).RecordNotFound() {
err = NotFound{"Category does not exist"}
}
return
}
// Categories returns a list of all Categories owned by user
func (db *DB) Categories(user *models.User) (categories []models.Category) {
db.db.Model(user).Association("Categories").Find(&categories)
return
}
// ChangeFeedCategory changes the category a feed belongs to
func (db *DB) ChangeFeedCategory(feedID string, ctgID string, user *models.User) error {
feed := &models.Feed{}
if db.db.Model(user).Where("uuid = ?", feedID).Related(feed).RecordNotFound() {
return NotFound{"Feed does not exist"}
}
prevCtg := &models.Category{
ID: feed.CategoryID,
}
db.db.First(prevCtg)
db.db.Model(prevCtg).Association("Feeds").Delete(feed)
newCtg := &models.Category{}
if db.db.Model(user).Where("uuid = ?", ctgID).Related(newCtg).RecordNotFound() {
return NotFound{"Category does not exist"}
}
db.db.Model(newCtg).Association("Feeds").Append(feed)
return nil
}
// NewEntry creates a new Entry object owned by user
func (db *DB) NewEntry(entry *models.Entry, user *models.User) error {
if entry.Feed.UUID == "" {
return BadRequest{"Entry should have a feed"}
}
feed := models.Feed{}
if db.db.Model(user).Where("uuid = ?", entry.Feed.UUID).Related(&feed).RecordNotFound() {
return NotFound{"Feed does not exist"}
}
entry.UUID = uuid.NewV4().String()
entry.Feed = feed
entry.FeedID = feed.ID
db.db.Model(user).Association("Entries").Append(entry)
db.db.Model(&feed).Association("Entries").Append(entry)
return nil
}
// NewEntries creates multiple new Entry objects which
// are all owned by feed with feedUUID and user
func (db *DB) NewEntries(entries []models.Entry, feed models.Feed, user *models.User) error {
if feed.UUID == "" {
return BadRequest{"Entry should have a feed"}
}
if len(entries) == 0 {
return nil
}
if db.db.Model(user).Where("uuid = ?", feed.UUID).Related(&feed).RecordNotFound() {
return NotFound{"Feed does not exist"}
}
for _, entry := range entries {
entry.UUID = uuid.NewV4().String()
entry.Feed = feed
entry.FeedID = feed.ID
db.db.Model(user).Association("Entries").Append(&entry)
db.db.Model(&feed).Association("Entries").Append(&entry)
}
return nil
}
// Entry returns an Entry with id and owned by user
func (db *DB) Entry(id string, user *models.User) (entry models.Entry, err error) {
if db.db.Model(user).Where("uuid = ?", id).Related(&entry).RecordNotFound() {
err = NotFound{"Feed does not exists"}
return
}
db.db.Model(&entry).Related(&entry.Feed)
return
}
// EntryWithGUIDExists returns true if an Entry exists with the given guid and is owned by user
func (db *DB) EntryWithGUIDExists(guid string, user *models.User) bool {
return !db.db.Model(user).Where("guid = ?", guid).Related(&models.Entry{}).RecordNotFound()
}
// Entries returns a list of all entries owned by user
func (db *DB) Entries(orderByDesc bool, marker models.Marker, user *models.User) (entries []models.Entry, err error) {
if marker == models.None {
err = BadRequest{"Request should include a valid marker"}
return
}
query := db.db.Model(user)
if marker != models.Any {
query = query.Where("mark = ?", marker)
}
query.Association("Entries").Find(&entries)
return
}
// EntriesFromFeed returns all Entries that belong to a feed with feedID
func (db *DB) EntriesFromFeed(feedID string, orderByDesc bool, marker models.Marker, user *models.User) (entries []models.Entry, err error) {
if marker == models.None {
err = BadRequest{"Request should include a valid marker"}
return
}
feed := &models.Feed{}
if db.db.Model(user).Where("uuid = ?", feedID).Related(feed).RecordNotFound() {
err = NotFound{"Feed not found"}
return
}
query := db.db.Model(feed)
if marker != models.Any {
query = query.Where("mark = ?", marker)
}
query.Association("Entries").Find(&entries)
return
}
// EntriesFromCategory returns all Entries that are related to a Category with categoryID by the entries' owning Feed
func (db *DB) EntriesFromCategory(categoryID string, orderByDesc bool, marker models.Marker, user *models.User) (entries []models.Entry, err error) {
if marker == models.None {
err = BadRequest{"Request should include a valid marker"}
return
}
category := &models.Category{}
if db.db.Model(user).Where("uuid = ?", categoryID).Related(category).RecordNotFound() {
err = NotFound{"Category not found"}
return
}
var feeds []models.Feed
db.db.Model(category).Related(&feeds)
var order *gorm.DB
if orderByDesc {
order = db.db.Model(user).Order("created_at DESC")
} else {
order = db.db.Model(user).Order("created_at ASC")
}
if marker != models.Any {
order = order.Where("mark = ?", marker)
}
feedIds := make([]uint, len(feeds))
for i, feed := range feeds {
feedIds[i] = feed.ID
}
order.Where("feed_id in (?)", feedIds).Association("Entries").Find(&entries)
return
}
// EntriesFromTag returns all Entries which are tagged with tagID
func (db *DB) EntriesFromTag(tagID string, makrer models.Marker, orderByDesc bool, user *models.User) (entries []models.Entry, err error) {
// TODO
return
}
// CategoryStats returns all Stats for a Category with the given id and that is owned by user
func (db *DB) CategoryStats(id string, user *models.User) (stats models.Stats, err error) {
ctg := &models.Category{}
if db.db.Model(user).Where("uuid = ?", id).Related(ctg).RecordNotFound() {
err = NotFound{"Category not found"}
return
}
var feeds []models.Feed
db.db.Model(&ctg).Association("Feeds").Find(&feeds)
feedIds := make([]uint, len(feeds))
for i, feed := range feeds {
feedIds[i] = feed.ID
}
query := db.db.Model(user).Where("feed_id in (?)", feedIds)
stats.Unread = query.Where("mark = ?", models.Unread).Association("Entries").Count()
stats.Read = query.Where("mark = ?", models.Read).Association("Entries").Count()
stats.Saved = query.Where("saved = ?", true).Association("Entries").Count()
stats.Total = query.Association("Entries").Count()
return
}
// FeedStats returns all Stats for a Feed with the given id and that is owned by user
func (db *DB) FeedStats(id string, user *models.User) (stats models.Stats, err error) {
feed := &models.Feed{}
if db.db.Model(user).Where("uuid = ?", id).Related(feed).RecordNotFound() {
err = NotFound{"Feed not found"}
return
}
stats.Unread = db.db.Model(user).Where("feed_id = ? AND mark = ?", feed.ID, models.Unread).Association("Entries").Count()
stats.Read = db.db.Model(user).Where("feed_id = ? AND mark = ?", feed.ID, models.Read).Association("Entries").Count()
stats.Saved = db.db.Model(user).Where("feed_id = ? AND saved = ?", feed.ID, true).Association("Entries").Count()
stats.Total = db.db.Model(user).Where("feed_id = ?", feed.ID).Association("Entries").Count()
return
}
// Stats returns all Stats for the given user
func (db *DB) Stats(user *models.User) (stats models.Stats) {
stats.Unread = db.db.Model(user).Where("mark = ?", models.Unread).Association("Entries").Count()
stats.Read = db.db.Model(user).Where("mark = ?", models.Read).Association("Entries").Count()
stats.Saved = db.db.Model(user).Where("saved = ?", true).Association("Entries").Count()
stats.Total = db.db.Model(user).Association("Entries").Count()
return
}
// MarkFeed applies marker to a Feed with id and owned by user
func (db *DB) MarkFeed(id string, marker models.Marker, user *models.User) error {
feed, err := db.Feed(id, user)
if err != nil {
return err
}
db.db.Model(&models.Entry{}).Where("user_id = ? AND feed_id = ?", user.ID, feed.ID).Update(models.Entry{Mark: marker})
return nil
}
// MarkCategory applies marker to a category with id and owned by user
func (db *DB) MarkCategory(id string, marker models.Marker, user *models.User) error {
ctg, err := db.Category(id, user)
if err != nil {
return err
}
var feeds []models.Feed
db.db.Model(&ctg).Association("Feeds").Find(&feeds)
feedIds := make([]uint, len(feeds))
for i, feed := range feeds {
feedIds[i] = feed.ID
}
db.db.Model(&models.Entry{}).Where("user_id = ?", user.ID).Where("feed_id in (?)", feedIds).Update(models.Entry{Mark: marker})
return nil
}
// MarkEntry applies marker to an entry with id and owned by user
func (db *DB) MarkEntry(id string, marker models.Marker, user *models.User) error {
entry, err := db.Entry(id, user)
if err != nil {
return err
}
db.db.Model(&entry).Update(models.Entry{Mark: marker})
return nil
}
// DeleteAll records in the database
func (db *DB) DeleteAll() {
db.db.Delete(&models.Feed{})
db.db.Delete(&models.Category{})
db.db.Delete(&models.User{})
db.db.Delete(&models.Entry{})
db.db.Delete(&models.Tag{})
db.db.Delete(&models.APIKey{})
}