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index.js
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index.js
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var createHmac = require('create-hmac')
/**
* @param {[type]} securityKey
* @param {[type]} thumborServerUrl
*/
function Thumbor(securityKey, thumborServerUrl) {
'use strict'
this.THUMBOR_SECURITY_KEY = securityKey
this.THUMBOR_URL_SERVER = thumborServerUrl
this.imagePath = ''
this.width = 0
this.height = 0
this.smart = false
this.fitInFlag = false
this.withFlipHorizontally = false
this.withFlipVertically = false
this.halignValue = null
this.valignValue = null
this.cropValues = null
this.meta = false
this.filtersCalls = ''
}
Thumbor.prototype = {
TOP: 'top',
MIDDLE: 'middle',
BOTTOM: 'bottom',
RIGHT: 'right',
CENTER: 'center',
LEFT: 'left',
/**
* Set path of image
* @param {String} imagePath [description]
*/
setImagePath: function(imagePath) {
this.imagePath =
imagePath.charAt(0) === '/'
? imagePath.substring(1, imagePath.length)
: imagePath
return this
},
/**
* Converts operation array to string
* @return {String}
*/
getOperationPath: function() {
let parts = this.urlParts()
if (0 === parts.length) {
return ''
}
return parts.join('/') + '/'
},
/**
* Build operation array
* @return {Array}
*/
urlParts: function() {
if (!this.imagePath) {
throw new Error("The image url can't be null or empty.")
}
let parts = []
if (this.meta) {
parts.push('meta')
}
if (this.cropValues) {
parts.push(
this.cropValues.left +
'x' +
this.cropValues.top +
':' +
this.cropValues.right +
'x' +
this.cropValues.bottom
)
}
if (this.fitInFlag) {
parts.push('fit-in')
}
if (
this.width ||
this.height ||
this.withFlipHorizontally ||
this.withFlipVertically
) {
let sizeString = ''
if (this.withFlipHorizontally) {
sizeString += '-'
}
sizeString += this.width
sizeString += 'x'
if (this.withFlipVertically) {
sizeString += '-'
}
sizeString += this.height
parts.push(sizeString)
}
if (this.halignValue) {
parts.push(this.halignValue)
}
if (this.valignValue) {
parts.push(this.valignValue)
}
if (this.smart) {
parts.push('smart')
}
if (this.filtersCalls.length) {
parts.push('filters:' + this.filtersCalls)
}
return parts
},
/**
* Resize the image to the specified dimensions. Overrides any previous call
* to `fitIn` or `resize`.
*
* Use a value of 0 for proportional resizing. E.g. for a 640 x 480 image,
* `.resize(320, 0)` yields a 320 x 240 thumbnail.
*
* Use a value of 'orig' to use an original image dimension. E.g. for a 640
* x 480 image, `.resize(320, 'orig')` yields a 320 x 480 thumbnail.
* @param {String} width
* @param {String} height
*/
resize: function(width, height) {
this.width = width
this.height = height
this.fitInFlag = false
return this
},
smartCrop: function(smartCrop) {
this.smart = smartCrop
return this
},
/**
* Resize the image to fit in a box of the specified dimensions. Overrides
* any previous call to `fitIn` or `resize`.
*
* @param {String} width
* @param {String} height
*/
fitIn: function(width, height) {
this.width = width
this.height = height
this.fitInFlag = true
return this
},
/**
* Flip image horizontally
*/
flipHorizontally: function() {
this.withFlipHorizontally = true
return this
},
/**
* Flip image vertically
*/
flipVertically: function() {
this.withFlipVertically = true
return this
},
/**
* Specify horizontal alignment used if width is altered due to cropping
* @param {String} halign 'left', 'center', 'right'
*/
halign: function(halign) {
if (
halign === this.LEFT ||
halign === this.RIGHT ||
halign === this.CENTER
) {
this.halignValue = halign
} else {
throw new Error('Horizontal align must be left, right or center.')
}
return this
},
/**
* Specify vertical alignment used if height is altered due to cropping
* @param {String} valign 'top', 'middle', 'bottom'
*/
valign: function(valign) {
if (
valign === this.TOP ||
valign === this.BOTTOM ||
valign === this.MIDDLE
) {
this.valignValue = valign
} else {
throw new Error('Vertical align must be top, bottom or middle.')
}
return this
},
/**
* Specify that JSON metadata should be returned instead of the thumbnailed
* image.
* @param {Boolean} metaDataOnly [description]
*/
metaDataOnly: function(metaDataOnly) {
this.meta = metaDataOnly
return this
},
/**
* Append a filter, e.g. quality(80)
* @param {String} filterCall
*/
filter: function(filterCall) {
this.filtersCalls = filterCall
return this
},
/**
* Manually specify crop window.
* @param {Integer} left
* @param {Integer} top
* @param {Integer} right
* @param {Integer} bottom
* @return {[type]}
*/
crop: function(left, top, right, bottom) {
this.cropValues = {
left: left,
top: top,
right: right,
bottom: bottom
}
return this
},
/**
* Combine image url and operations with secure and unsecure (unsafe) paths
* @return {String}
*/
buildUrl: function() {
let operation = this.getOperationPath()
if (this.THUMBOR_SECURITY_KEY) {
var key = createHmac('sha1', this.THUMBOR_SECURITY_KEY)
.update(operation + this.imagePath)
.digest('base64')
key = key.replace(/\+/g, '-').replace(/\//g, '_')
return (
this.THUMBOR_URL_SERVER + '/' + key + '/' + operation + this.imagePath
)
} else {
return this.THUMBOR_URL_SERVER + '/unsafe/' + operation + this.imagePath
}
}
}
module.exports = Thumbor