isleward/src/server/items/salvager.js

let mappings = {
	rune: [{
		materials: [{
			name: 'Essence',
			qualityName: ['Common Essence', 'Magic Essence', 'Rare Essence', 'Epic Essence', 'Legendary Essence'],
			chance: 100,
			quantity: 1
		}]
	}],
	slots: [{
		list: ['neck', 'finger', 'twoHanded', 'oneHanded', 'offHand'],
		materials: [{
			name: 'Iron Bar',
			chance: 100,
			quantity: 3,
			qualityMult: 1
		}]
	}, {
		list: ['trinket'],
		materials: [{
			name: 'Essence',
			qualityName: ['Common Essence', 'Magic Essence', 'Rare Essence', 'Epic Essence', 'Legendary Essence'],
			chance: 100,
			quantity: 1
		}]
	}, {
		list: ['tool'],
		materials: [{
			name: 'Cerulean Pearl',
			chance: 100,
			quantity: 1,
			quality: 3,
			qualityMult: 1
		}]
	}],
	types: [{
		list: ['Helmet', 'Belt', 'Legplates', 'Gauntlets', 'Steel Boots', 'Breastplate'],
		materials: [{
			name: 'Iron Bar',
			chance: 100,
			quantity: 3,
			qualityMult: 1
		}]
	}, {
		list: ['Cowl', 'Robe', 'Gloves', 'Sash', 'Pants', 'Boots'],
		materials: [{
			name: 'Cloth Scrap',
			chance: 100,
			quantity: 3,
			qualityMult: 1
		}]
	}, {
		list: ['Leather Cap', 'Leather Armor', 'Leather Gloves', 'Leather Belt', 'Leather Pants', 'Leather Boots', 'Facemask', 'Scalemail', 'Scale Gloves', 'Scaled Binding', 'Scale Leggings', 'Scale Boots'],
		materials: [{
			name: 'Leather Scrap',
			chance: 100,
			quantity: 3,
			qualityMult: 1
		}]
	}, {
		list: ['Fishing Rod'],
		materials: [{
			name: 'Cerulean Pearl',
			chance: 100,
			quantity: 1,
			qualityMult: 1
		}]
	}]
};

let materialItems = {
	'Iron Bar': {
		sprite: [0, 0]
	},
	'Cloth Scrap': {
		sprite: [0, 1]
	},
	'Leather Scrap': {
		sprite: [0, 7]
	},
	'Common Essence': {
		sprite: [0, 2]
	},
	'Magic Essence': {
		sprite: [0, 3]
	},
	'Rare Essence': {
		sprite: [0, 4]
	},
	'Epic Essence': {
		sprite: [0, 5]
	},
	'Legendary Essence': {
		sprite: [0, 6]
	},
	'Cerulean Pearl': {
		sprite: [11, 9]
	}
};
	
module.exports = {
	salvage: function (item, maxRoll) {
		let result = [];

		let materials = [];

		let temp = mappings.slots.filter(m => m.list.indexOf(item.slot) > -1);
		temp = temp.concat(mappings.types.filter(m => m.list.indexOf(item.type) > -1));

		if (item.ability) 
			temp = temp.concat(mappings.rune);

		temp.forEach(function (t) {
			let mats = t.materials;
			mats.forEach(function (m) {
				let exists = materials.find(mf => (mf.name === m.name));
				if (exists) {
					exists.chance = Math.max(exists.chance, m.chance);
					exists.quantity = Math.max(exists.quantity, m.quantity);
					exists.qualityMult = Math.max(exists.qualityMult, m.qualityMult);
				} else
					materials.push(extend(true, {}, m));
			});
		});

		materials.forEach(function (m) {
			if ((!maxRoll) && (Math.random() * 100 > m.chance))
				return;

			let max = m.quantity;
			if (m.qualityMult)
				max *= (m.qualityMult * (item.quality + 1));

			let quantity = Math.ceil(random.norm(0, 1) * max) || 1;
			if (maxRoll)
				quantity = Math.ceil(max);

			let newItem = {
				name: m.name,
				quantity: quantity,
				quality: 0,
				material: true,
				sprite: null
			};

			if (m.qualityName) {
				newItem.quality = item.quality;
				newItem.name = m.qualityName[item.quality];
			} else if (m.quality !== null)
				newItem.quality = m.quality;

			newItem.sprite = materialItems[newItem.name].sprite;

			result.push(newItem);
		});

		return result;
	}
};